URI Online Judge | 2679

Even Successor

By Emílio Wuerges, UFFS BR Brazil

Time limit: 1

To get you ready for the other problems, lets perform a test. Given a number X, return the smallest even number larger than X.

Input

A line containing a single number 0 < X < 107.

Output

A line containing the answer to the problem.

Input Sample Output Sample

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