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

int main() {
    vector<int> odd;
    vector<int> even;
    for (int i = 1; i <= 3; i++) {
        int x; cin >> x;
        if (x & 1) {
            odd.push_back(x);
        }
        else {
            even.push_back(x);
        }
    }

    if (odd.size() == 1) {
        cout << odd[0] << endl;
    }
    else {
        cout << even[0] << endl;
    }

}