#include <bits/stdc++.h>     //   All praise is due to Allah alone, and peace and blessings be
using namespace std;         //         upon him, after whom there is no other Prophet.

int32_t main() {
    cin.tie(0)->sync_with_stdio(false);

    int32_t Case = 1;    //cin >> Case;
    for (int T = 1; T <= Case; T++) {

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

        function<void()> Test_Case = [&]() {
            if(a & 1) {
                if(b & 1) cout << c;
                else if(c & 1) cout << b;
                else cout << a;
            }
            else if(b & 1) {
                if(a & 1) cout << c;
                else if(c & 1) cout << a;
                else cout << b;
            }
            else  {
                if(a & 1) cout << b;
                else if(b & 1) cout << a;
                else cout << c;
            }
        };
        Test_Case();
    }
    return 0;
}