A. Hexagonal numberstime limit per test2 secondsmemory limit per test64 megabytesinputstandard inputoutputstandard outputHexagonal 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.ExamplesInput2Output6Input5Output45
Input2
Output6
['*special problem', 'implementation', '*900']