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#include <iostream>
#include <vector>

using namespace std;


int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	int x, d, h, m; cin >> x >> d >> h >> m;
	int minuty = 0;

	if (x != 5) {
		minuty += (x + 23 - d) * 1440;
		minuty += (24 - h) * 60;
		minuty -= m;
	}
	else {
		minuty += (29 - d) * 1440;
		minuty += (24 - h) * 60;
		minuty -= m + 60;
		if (d == 29 && (h > 2)) minuty += 60;
	}
	cout << minuty;

}