# -*- coding: UTF-8 -*-
# 作者：幻灰龙
# 标题：Python 函数
# 描述：循环计算阶乘函数

def fact(n):
    sum = 1
    for i in range(0, n):
        sum *= (i+1)
    return sum


if __name__ == '__main__':
    print(fact(10))