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#include <bits/stdc++.h>
using namespace std;

int round_ends[5] = {24, 25, 26, 27, 29};

int main() {
	std::ios_base::sync_with_stdio(false);

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

	int time = (round_ends[x - 1] - d) * 24 * 60 + (24 - h - 1) * 60 + (60 - m);

	if (x == 5 && (d < 29 || d == 29 && h < 2)) {
		time -= 60;
	}

	cout << time << "\n";
}