#include<bits/stdc++.h>
using namespace std;
int main ()
{
  int a,b,c;
  cin>>a>>b>>c;
  if(a%2!=0 && b%2!=0)
  {
     cout<<c<<endl;
  }
  else if(a%2!=0 && c%2!=0)
  {
     cout<<b<<endl;
  }
  else if(b%2!=0 && c%2!=0)
  {
     cout<<a<<endl;
  }
  else{
    cout<<<<endl;
  }
}