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Statement
While playing with geometric figures Alex has accidentally invented a concept of a -th order rhombus in a cell grid.
A -st order rhombus is just a square (i.e just a cell).
A -th order rhombus for all one obtains from a -th order rhombus adding all cells which have a common side with it to it (look at the picture to understand it better).
Alex asks you to compute the number of cells in a -th order rhombus.
Format
Input
The first and only input line contains integer ( ) — order of a rhombus whose numbers of cells should be computed.
Output
Print exactly one integer — the number of cells in a -th order rhombus.
Sample
1
1
2
5
3
13
ShanghaiTech ACM 炸鱼杯
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