#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<<endl;
        else if (y<0) cout<<y<<endl;
        else if (z<0) cout<<z<<endl;
    }
    else {
        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;
}