#include <stdio.h>

int main()
{
	int a,b;
	scanf("%d%d",&a,&b);
	if(a>b)
	{
		int temp = a;
		a = b;
		b = temp;
	}
	if(a>=4) printf("%d",a-4);
	else if(b>=8) printf("%d",b-4);
	else printf("%d",b+4);
}