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RGB7217 - Давхар факториал

n!! - ыг ол. n тоо тэгш бол n хүртэлх тэгш тоонуудын үржвэр. n тоо сондгой бол n хүртэлх сондгой тоонуудын үржвэр. n=6 үед 2*4*6=48, n=7 үед 1*3*5*7=105

Input

Натурал тоо өгөгдөнө.

Output

Давхар факториал.

Example

Input:
6

Output:
48

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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