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

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);

	int Round, Day, Hour, Minute, res = 0;
	vector<int> scheme = {0, 24, 25, 26, 27, 29};
	cin >> Round >> Day >> Hour >> Minute;

	res += (scheme[Round] - Day) * 60 * 24;
	res += (23 - Hour) * 60;
	res += 60 - Minute;

	if( Round == 5 && (Day != 29 || Hour < 2) )
		res -= 60;

	cout << res;
	return 0;
}