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

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

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

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

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

}