#include<bits/stdc++.h>
using namespace std;

#define ll long long
#define endl '\n'

long long toNum(string s){
    long long num = 0;
    for(int i = 0 ; i < s.size() ; i++){
        num = (num * 10) + (s[i] - '0');
    }
    return num;
}

void solve(){
    ll a, b, c;
    cin >> a >> b >> c;
    if(a % 2 && b % 2)  cout << c;
    else if(a % 2 && c % 2) cout << b;
    else if(b % 2 && c % 2) cout << a;
    else if(a % 2 == 0 && b % 2 == 0)  cout << c;
    else if(a % 2 == 0 && c % 2 == 0) cout << b;
    else if(b % 2 == 0 && c % 2 == 0) cout << a;
}

int main(){
    ios_base::sync_with_stdio(0), cin.tie(0);
    int t = 1;
    // cin >> t;
    while(t--){
        solve();
    }
    return 0;
}