B. Startime limit per test2 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard output  InputThe input contains a single integer a (1 ≤ a ≤ 18257).OutputPrint a single integer output (1 ≤ output ≤ 2·109).ExamplesInput2Output13
Input2
Output13
['*special problem', 'combinatorics', '*1300']