//parity
#include <iostream>
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<<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<<y<<endl;
    }
    else if(x%2!=0 && y%2!=0 && z%2==0){
        cout<<z<<endl;
    }
    else if(x%2==0 && y%2==0 && z%2!=0){
        cout<<z<<endl;
    }
    

    return 0;
}