#include <bits/stdc++.h>
using namespace std;
#define fast ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define ll long long
int main()
{
    fast
    /*ll t;
    cin>>t;
    while(t--) solve*/

    int x, y, z;
    cin>>x>>y>>z;

    vector <int> o, e;
    if (x%2 == 0) e.push_back(x);
    else o.push_back(x);
    if (y%2 == 0) e.push_back(y);
    else o.push_back(z);
    if (z%2 == 0) e.push_back(z);
    else o.push_back(z);

    if (o.size() == 1) cout<<o[0];
    else cout<<e[0];
    return 0;
}