1. 26.
    0
    ___$$$$$$$___________$$$$$$$
    _____$$$$$$$$_______$$$$$$$$
    ______$$$$$$$$$_____$$$$$$$
    ________$$$$$$$$____$$$$$$$
    _________$$$$$$$$$__$$$$$$
    ____________$$$$$$$$$$$$$
    _______________$$$$$$$$$
    __________$$$$$$$$$$$$$
    ________$$$$$$$$$$$$$$$$
    _______$$$___$$$$$$$$$$$$
    ______$$$$$_$$$$$$$$$$$$$
    _____$$$$$$$$$$$$$$$$$$$$
    ______$$$$$$$$$$$$$$$$$$$
    _______$$$$$$$$$$$$$$$$$
    ___________$$$$$$$$$$$$$
    __________$$$$$$$$$$$$$
    ···
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