Write a python to find the number of zeros at the end of a factorial of a given positive number.
求给定正数的阶乘末尾的零个数。
def calcZero(n):
z = 0
for i in range(5, n + 1, 5):
x = i
while x % 5== 0:
z += 1
x //= 5
return z
res = calcZero(100)
print(res)