Time Limit: 1.0 s

Memory Limit: 256.0 MB

Description

Given a number \(N\), print a non-negative even number less then or equal to \(N\).

Format

Input

A number \(1 <= N <= 100\).

Output

One non-negative even number less then or equal to \(N\).

Sample

100

2

Note: 0 is a non-negative even number, as it is larger then -1 and its reminder is 0 when divided by 2.