1506: 用递归法求n!

Memory Limit:128 MB Time Limit:1.000 S
Judge Style:Text Compare Creator:
Submit:7261 Solved:5905

Description

用递归法求n的阶乘.

Input

一个正整数

Output

输出占一行,该正整数的阶乘.

Sample Input Copy

5

Sample Output Copy

120