#include <bits/stdc++.h>
using namespace std;

int main(){

int x,y,z;
cin>>x>>y>>z;

if(x%2==0 && y%2 == 0 && z%2!=0)
    cout<<z;

if(x%2==0 && y%2 != 0 && z%2==0)
    cout<<y;

    if(x%2!=0 && y%2 == 0 && z%2==0)
    cout<<x;


    if(x%2!=0 && y%2 != 0 && z%2==0)
    cout<<z;

  if(x%2!=0 && y%2 == 0 && z%2!=0)
    cout<<y;

    if(x%2==0 && y%2 != 0 && z%2!=0)
    cout<<x;



return 0;
}