/*
    Author: abdmahdi56
*/
#include <bits/stdc++.h>
#define endl '\n'
#define yes cout << "YES\n"
#define no cout << "NO\n"
#define ll long long
#define vi vector<ll>
#define all(v) v.begin(), v.end()
#define loop(n) for(int i = 0; i < (n); i++)

using namespace std;

void Bismillah() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
}

void solve() {
       int a[3];
       vi e;
       vi o;
       for(int i=0;i<3;i++){
        cin>>a[i];
        if(a[i]%2==0){
            e.push_back(i);
        }else{
            o.push_back(i);
        }
       }

       if(e.size()==1){
           int it=e[0];
        cout<<a[it];
       }else{
           int it=o[0];
           cout<<a[it];
       }





}
int main() {
    Bismillah();
    int t=1;
    //cin >> t=1;
    while (t--) {
        solve();
    }
    return 0;
}