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

int main(){

    int x,y,z;
    cin>>x>>y>>z;
    
    if(x%2==0 && y%2==0){
        cout<<z<<endl;
    }
    else if(y%2==0 && z%2==0){
        cout<<x<<endl;
    }
    else{
        cout<<y<<endl;
    }

return 0;
}