1. 1.
    -1
    http://imgim.com/1398462623156.gif
    ···
  2. 2.
    -1
    up up up up
    ···
  3. 3.
    0
    up up up up
    ···
  4. 4.
    0
    up up up up
    ···
  5. 5.
    0
    up up up up
    ···
  6. 6.
    0
    up up up
    ···
  7. 7.
    0
    up up up up
    ···
  8. 8.
    0
    up up up up
    ···
  9. 9.
    0
    up up up up
    ···
  10. 10.
    0
    up up up up
    ···