#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;
         }


         }