#include <stdio.h>

int main(){
   int x,y,z;
   scanf("%d %d %d",&x,&y,&z);
   if(x%2==0 || y%2==0 || z%2==0){
       printf("%d",z);
   }
  else  if(x%2==0 || y%2==0 || z%2==0){
       printf("%d",y);
   }
  else if(x%2==0 || y%2==0 || z%2==0){
       printf("%d",x);
   }
   return 0;
}