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#include <iostream>

using namespace std;

static int minutes_from_reference(int day, int hour, int minute) {
	int total = (day - 23) * 24 * 60 + hour * 60 + minute;
	if (day > 29 || (day == 29 && hour >= 3)) {
		total -= 60;
	}
	return total;
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	int x, d, h, m;
	cin >> x >> d >> h >> m;

	int end_day;
	if (x == 1) {
		end_day = 24;
	} else if (x == 2) {
		end_day = 25;
	} else if (x == 3) {
		end_day = 26;
	} else if (x == 4) {
		end_day = 27;
	} else {
		end_day = 29;
	}

	int start_minutes = minutes_from_reference(d, h, m);
	int finish_minutes = minutes_from_reference(end_day + 1, 0, 0);

	cout << (finish_minutes - start_minutes) << '\n';
	return 0;
}