3151: 阶乘和

Memory Limit:128 MB Time Limit:1.000 S
Judge Style:Text Compare Creator:
Submit:1 Solved:1

Description

求 S=1!+2!+3!+....+n!

Input

输入正整数n。(1≤n≤10)

Output

输出S。

Sample Input Copy

3

Sample Output Copy

9