#include <bits/stdc++.h>
using namespace std;
#define fast ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define ll long long
int main()
{
    fast
    /*ll t;
    cin>>t;
    while(t--) solve*/

    int x, y, z;
    cin>>x>>y>>z;
    int l_o = 0;
    vector <int> o, e;
 
    if (x==0) l_o++;
    if (y==0) l_o++;
    if(z==0) l_o++;
    
    if (l_o == 1) {
        if (x==0) cout<<x;
        else if (y==0) cout<<y;
        else cout<<z;
    }
    else if (l_o>1){
        if (x>0 or x<0) cout<<x;
        else if (y>0 or y<0) cout<<y;
        else cout<<z;
    }
    
    if (x%2 == 0) e.push_back(x);
    else o.push_back(x);
    if (y%2 == 0) e.push_back(y);
    else o.push_back(z);
    if (z%2 == 0) e.push_back(z);
    else o.push_back(z);

    if (o.size() == 1) cout<<o[0];
    else cout<<e[0];
        
    return 0;
}