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

int days[7] = {0, 23, 24, 25, 26, 27, 29};

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	int x, d, h, m; cin >> x >> d >> h >> m;
	int res = 0;
	
	if (x == 5){
		res = 60 * 60 - 60; 
		if (d == 27){
			res -= m;
			res -= abs((12 - h)) * 60;
		} else if (d == 28){
			res -= 12 * 60;
			res -= m;
			res -= h * 60;
		}else{
			if (h >= 3)
				res += 60;
			res -= 36 * 60; 
			res -= m; 
			res -= 60 * h;
		}
		if (res < 0)
			cout << 0 << '\n';
		else
			cout << res << '\n';
		return 0; 
	}

	res = 36 * 60; 
	res -= m;
	if (days[x] != d)
		res = res - 12 * 60 - h * 60;
	else
		res -= (h - 12) * 60;
	
	
	if (res < 0)
		cout << 0 << '\n';
	else
		cout << res << '\n';
	return 0;
}