#include<bits/stdc++.h>
using namespace std;
int main(){

    int a,b,c;
    cin>>a >>b >>c;

    if(a%2==0 && b%2==0){
        cout<<c;
    }
    else if(a%2!=0 && b%2!=0){
        cout<<c;
    }
    else if(a%2==0 && c%2==0){
        cout<<b;
    }
    else if(a%2!=0 && c%2!=0){
        cout<<b;
    }
    else if(b%2==0 && c%2==0){
        cout<<a;
    }
    else if(b%2!=0 && c%2!=0){
        cout<<a;
    }
    return 0;
}