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First solution in Clear category for Ghosts Age by Oleg_Domokeev
def checkio(opacity):
if opacity in (10000, 9999):
return 10000 - opacity
if opacity == 9997:
return 2
a, b, op = 1, 2, 9997
while op > opacity:
a, b, op = b, a + b, op - b - 1
return b + (opacity - op)
April 7, 2020
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