#include<bits/stdc++.h>
using namespace std;
#define ll long long
int main()
{
    int x,y,z; cin>>x>>y>>z;
    if(x%2==0 && y%2==0) cout<<z<<endl;
    else if(x%2==0 && z%2==0) cout<<y<<endl;
    else if(y%2==0 && z%2==0) cout<<x<<endl;
    else if(x%2!=0 && y%2!=0) cout<<z<<endl;
    else if(x%2!=0 && z%2!=0) cout<<y<<endl;
    else cout<<x<<endl;

    return 0;
}