21 lines
411 B
Python
21 lines
411 B
Python
def solve(N):
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if N == 0 or N == 1:
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return 0
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count2 = 0
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count5 = 0
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for i in range(2, N + 1):
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while i % 2 == 0 or i % 5 == 0:
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if i % 2 == 0:
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i //= 2
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count2 += 1
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elif i % 5 == 0:
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i //= 5
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count5 += 1
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return min((count2, count5))
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if __name__ == '__main__':
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print(solve(int(input())))
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