#include <stdio.h>

int main()
{
	int A, B;
	scanf("%d%d", &A, &B);

	int n = 0;
	if (23 < A || 23 > B)
		n++;
	if (24 < A || 24 > B)
		n++;
	if (25 < A || 25 > B)
		n++;

	printf("%d\n", n);
	return 0;
}