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