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14 lines
295 B
Python
14 lines
295 B
Python
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import math
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from decimal import *
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getcontext().prec = 100
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phi = (Decimal(5) ** Decimal(0.5) + 1) / Decimal(2)
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n = Decimal(int(input()) - 1)
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index = (math.floor(math.log(n * (phi + 2), phi) - 1) // 3) * 3 + 2
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num = round(phi ** Decimal(index + 1)) / (phi + 2)
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sum = num // 2
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print(int(sum))
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