#include <stdio.h>

int main(void)
{
	int a, b;
	int days = 0;

	scanf("%d %d", &a, &b);

	if (a > 25)
		days = 3;
	else if (b < 23)
		days = 3;
	else if (a == b)
		days = 2;
	else if (a <= 23 && b == 23)
		days = 2;
	else if (a <= 23 && b == 24)
		days = 1;
	else if (a <= 23 && b >= 25)
		days = 0;
	else if (a == 24 && b >= 25)
		days = 1;
	else if (a == 25)
		days = 2;

	printf("%d\n", days);

	return 0;
}