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


void solve(){
    ll a,b,c;
    cin >> a >> b >> c;

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

int main(){
    ll t=1;
   // cin >> t;

    while(t--){
        solve();
    }
}