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#include <iostream>
using namespace std;

int main() {
	long long x, d, h, m, dk, w = 0;
	cin >> x >> d >> h >> m;
	dk = 23 + ((6 * x) / 5);
	w += 60 - m;
	w += 60 * (23 - h);
	w += 1440 * (dk - d);
	if(x == 5 && !(d == 29 && h > 2)) w -= 60;
	cout << w;
}