pass

通过，测试的功能

"""
author:claire
data:2022年06月23
title = 数字的阶乘
"""

def factorial(n):
    result = 1
    for i in range(n,1,-1):
        result *= i

    print(result)
    return result

n = int(input())
if n<0:
    print("error")
elif n == 0:
    print("0的阶乘为1")
else:
    print(f"{n}的阶乘为{factorial(n)}")




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