#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<<x<<endl;
    }
    else if(x%2!=0 && y%2==0 && z%2!=0){
        cout<<y<<endl;
        
    }else if(x%2==0 && y%2==0 && z%2==0){
        cout<<z<<endl;
    }
    return 0;
}