Problem1200--求1+2!+3!+...+N!的和

1200: 求1+2!+3!+...+N!的和

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Time Limit : 1.000 sec  Memory Limit : 128 MiB

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Description

求1+2!+3!+...+N!的和

Input

N(N<20)

Output

输出1+2!+3!+...+N!

Sample Input Copy 

3

Sample Output Copy 

9

Source/Category

admin 
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