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

int main(){
    int x, y, z;
    cin >> x >> y >> z;
    if(x%2 == 0){
        if(y%2 == 0) cout << z;
        else if(z%2 == 0) cout <<y;
        else cout << x;
    }
    else{
        if(y%2 == 1) cout << z;
        else if(z%2 == 1) cout <<y;
        else cout << x;
    }
    return 0;
}