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RGB7219 - Факториалуудын нийлбэр

1!+2!+3!+...+n! нийлбэрийг ол.

Input

Натурал тоо n өгөгдөнө.

Output

Факториалуудын нийлбэр.

Example

Input:
5

Output:
153
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Added by:Bataa
Date:2013-01-21
Time limit:1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:NCSHARP C++ 4.3.2 CPP CPP14 JULIA PYPY3
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