Statement

Given a positive integer $n$, output the least common multiple (positive integer) of $2$ and $n$.

Input

Input a single integer $n$ on one line, where $2\leq n\leq 10^9$.

Output

Output an integer representing the least common multiple of $2$ and $n$.

Samples

7

14

114514

114514

Notes

$0\leq a,b,c\leq 1000$, and each edge length is input with no more than $2$ decimal places.