#include<stdio.h>
int main()
{
	int a, b;
	scanf("%d %d", &a, &b);
	if (a >= 12)
		a -= 12;
	if (60 * a - 11 * b >= 0)
		printf("%d\n", 60 * (60 * a - 11 * b) / 11);
	else
		printf("%d\n", 60 * (60 * a - 11 * b + 60 * 12) / 11);
	return 0;
}