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sota1235/0052.py

Created August 13, 2014 09:50
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AOJ #0052
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0052.py
# AOJ
# 0052
# python3
import math
while True:
n = int(input())
if n == 0: break
fac = str(math.factorial(n))
print(len(fac) - len(fac.rstrip('0')))
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