1067: 求阶乘

Memory Limit:128 MB Time Limit:1.000 S
Judge Style:Text Compare Creator:
Submit:22 Solved:16

Description

输入一个整数n,输出n的阶乘。n的阶乘=1*2*3*...*n

Input

3

Output

6

Sample Input Copy

5

Sample Output Copy

120