1. 1.
    +1 -1
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s

    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    s
    ···
  1. 2.
    0
    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
    ···
  2. 3.
    0
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ···