/*
 *   BISMILLAHIR RAHMANIR RAHIM
 *   ==========================
 *
 *   Submitted By: SAKLAN
 *   North East University Bangladesh
 */

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

#define int long long
#define ll long long
#define ld long double
#define cinv(v) for(auto &i:v) cin >> i;
#define vi vector<int>
#define vii vector<ll>
#define MOD 1000000007
#define coutv(v) for(auto e:v) cout << e << ' ';
#define srt(v) sort(v.begin(),v.end())
#define rsrt(v) sort(v.rbegin(),v.rend())
#define yes cout<<"Yes\n"
#define no cout<<"No\n"
#define mem(a,b) memset(a, b, sizeof(a) )
#define sqr(a) ((a) * (a))
#define file() freopen("input.txt","r",stdin);freopen("output.txt","w",stdout);
#define endl '\n'
#define saklan ios::sync_with_stdio(0); cin.tie(0);

ll gcd ( ll a, ll b ) { return __gcd ( a, b ); }
ll lcm ( ll a, ll b ) { return a * ( b / gcd ( a, b ) ); }



void solve(){
    int t = 1;
    //cin >>  t;
    while(t--){
        int a,b,c;cin>>a>>b>>c;
//        vi v;
//        v.push_back(a);
//        v.push_back(b);
//        v.push_back(c);
//
//        srt(v);
//
//        int odd = 0;
//
//        for(int i = 0; i < 3; i++){
//            if(v[i] % 2 == 1) odd++;
//        }
//
//        int even = 3 - odd;
//
//        if(even > odd){
//            for(int i = 0; i < 3; i++){
//                if(v[i]%2==0) cout << v[i] << endl;
//                return;
//            }
//        }else{
//            for(int i = 0; i < 3; i++){
//                if(v[i]%2) cout << v[i] << endl;
//                return;
//            }
//        }
//        int odd = 0, even = 0;
//
//        if(a%2) odd++;
//        else even++;
//
//        if(b%2) odd++;
//        else even++;
//        if(c%2) odd++;
//        else even++;
//
//        int res = min(odd,even);
//
//        if(res%2){
//            if(a%2) cout << a << endl;
//            else if(b%2) 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;
//        }



        if (a % 2 == b % 2) {
            cout << c << endl;
        } else if (a % 2 == c % 2) {
            cout << b << endl;
        } else {
            cout << a << endl;
        }
    }
}




int32_t main() {
    saklan
    solve();

    return 0;
}