#include <bits/stdc++.h>
#define int long long
using namespace std;
/*
        OBSERVATIONS:


*/
signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int a, b, c;
    cin >> a >> b >> c;
    int odd = 0, even = 0;
    if (a & 1)
    {
        odd++;
    }
    else
        even++;
    if (b & 1)
        odd++;
    else
        even++;
    if (c & 1)
        odd++;
    else
        even++;
    if (odd == 1)
    {
        if (a & 1)
            cout << a << endl;
        else if (b & 1)
            cout << b << endl;
        else
            cout << c << endl;
    }
    else
    {
        if (a % 2 == 0)
            cout << a << endl;
        else if (b % 2 == 0)
            cout << b << endl;
        else
            cout << c << endl;
    }
    return 0;
}