#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) ||(x%2==0 && y%2==0 && z%2!=0)){
            printf("%d\n",z);
      }
      else if((x%2!=0 && z%2!=0 && y%2==0) ||(x%2==0 && z%2==0 && y%2!=0)){
            printf("%d\n",y);
      }
      else if((y%2!=0 && z%2!=0 && x%2==0) ||(y%2==0 && z%2==0 && x%2!=0)){
            printf("%d\n",x);
      }

return 0;
}