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RGB7216 - Үржвэр нийлбэр 4

1*2*3+2*3*4+3*4*5+...+n*(n+1)*(n+2) нийлбэрийг ол.

Input

Натурал тоо өгөгдөнө.

Output

Нийлбэр.

Example

Input:
4

Output:
210
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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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