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#include <cstdio>

using namespace std;

int calcMin(int d, int h, int m)
{
	return (24 * d + h) * 60 + m;
}

int main()
{
	int x,d, h,m;
	scanf("%d %d %d %d", &x, &d, &h, &m);
	 int roundEnd = 0;
	switch (x)
	{
	case 1:
			roundEnd = calcMin(25, 0, 0);
		break;
	case 2:
			roundEnd = calcMin(26, 0, 0);
		break;
	case 3:
			roundEnd = calcMin(27, 0, 0);
		break;
	case 4:
			roundEnd = calcMin(28, 0, 0);
		break;
	case 5:
			if(d<29 || h<3)
			{
				h++;
			}
			roundEnd = calcMin(30, 0, 0);
		break;
		
	default:
		break;
	}
	printf("%d", roundEnd - calcMin(d,h,m));

	return 0;
}