51nod1057(python2计算n！)

题目链接：www.51nod.com/onlineJudge/questionCode.html#!problemId=1057

 

思路：直接for循环呗～

 

代码：

n = int( raw_input() );
ans = 1;
for i in range(2,n+1):
    ans *= i;
print ans;