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RGB7406 - Илэрхийлэл 1

1*2  + 2*3*4 + 3*4*5*6 + ... + n*(n+1)*...*2*n илэрхийллийг бод.

Input

Натурал тоо n өгөгдөнө. n<10.

Output

Илэрхийллийн утга.

Example

Input:

2

Output:

26

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Added by:Bataa
Date:2013-02-04
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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