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