Problem1177--阶乘

1177: 阶乘

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Time Limit : 1.000 sec  Memory Limit : 128 MB

SubmitSolved: 14Submit Num: 33Statistics

Description

s=1!+2!+…+n!，输入n，求s。

Input

输入n

Output

求s

Sample Input Copy 

2

Sample Output Copy 

3

Source/Category

循环结构 累加 累乘 
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