3072: 递归-阶乘

Memory Limit:128 MB Time Limit:1.000 S
Judge Style:Text Compare Creator:
Submit:10 Solved:6

Description

输入一个非负整数n,递归计算n!(n的阶乘)。

Input

一个整数n(0 ≤ n ≤ 12)

Output

n!的值

Sample Input Copy

5

Sample Output Copy

120