Problem D: 阶乘之和
Memory Limit:128 MB
Time Limit:1.000 S
Judge Style:Text Compare
Creator:
Submit:36
Solved:16
Description
输入一个数n(n<=50),计算S=1!+2!+3!+4!+...+(n-1)!+n!
Input
一个正整数n
Output
阶乘和
Sample Input Copy
4
Sample Output Copy
33