Time Limit: 1.0 s

Memory Limit: 512.0 MB

Description

You are given three integer \(x,y,z\) where any two number has the same parity.
Print the number with the different parity.

Input

one line contains three integer \(x,y,z\)

Output

one integer, the number which has different parity from others

Sample

1 2 3

2