#include<bits/stdc++.h>
using namespace std;
int main()
{
   int a,b,c;
   cin>>a>>b>>c;

   if(a%2==0 && b%2==0 && c%2==1){
    cout<<c;
   }
  if(a%2==0 && b%2==1 && c%2==0){
    cout<<b;
   }
    if(a%2==1 && b%2==0 && c%2==0){
    cout<<a;
   }
    if(a%2==1 && b%2==1 && c%2==0){
    cout<<c;
   }
    if(a%2==1 && b%2==0 && c%2==1){
    cout<<b;
   }
    if(a%2==0 && b%2==1 && c%2==1){
    cout<<a;
   }
}