#P171B. Star
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ID: 2343
Type: RemoteJudge
2000ms
256MiB
Tried: 0
Accepted: 0
Difficulty: (None)
Uploaded By:
Hydro
Tags> Star
No submission language available for this problem.
Description
The input contains a single integer a (1 ≤ a ≤ 18257).
Print a single integer output (1 ≤ output ≤ 2·109).
Input
The input contains a single integer a (1 ≤ a ≤ 18257).
Output
Print a single integer output (1 ≤ output ≤ 2·109).
Samples
2
13