#include<stdio.h>
int main()
{
	int a, b;
	scanf("%d %d", &a, &b);
	int ans = 0;
	if (23 < a || b < 23)ans++;
	if (24 < a || b < 24)ans++;
	if (25 < a || b < 25)ans++;
	printf("%d\n", ans);
	return 0;
}