300680: CF130A. Hexagonal numbers
Memory Limit:64 MB
Time Limit:2 S
Judge Style:Text Compare
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Description
A. Hexagonal numberstime limit per test2 secondsmemory limit per test64 megabytesinputstandard inputoutputstandard output
Hexagonal numbers are figurate numbers which can be calculated using the formula hn = 2n2 - n. You are given n; calculate n-th hexagonal number.
InputThe only line of input contains an integer n (1 ≤ n ≤ 100).
OutputOutput the n-th hexagonal number.
ExamplesInput2Output
6Input
5Output
45