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#include <bits/stdc++.h>

using namespace std;

#define fi first
#define se second

const int MAXN = 1e6 + 7;

int d_end[6] = {0, 25, 26, 27, 28, 30};

int get_minutes(int d, int h, int m){
	
	int res = (d - 23) * 1440 + h * 60 + m;
	
	if(d > 29 || (d == 29 && h >= 3)){
		
		res -= 60;
	}
	
	return res;
}

void solve(){
	
	int x, d, h, m;
	cin >> x >> d >> h >> m;
	
	int end_time = get_minutes(d_end[x], 0, 0);
	int start_time = get_minutes(d, h, m);
	
	cout << end_time - start_time << '\n';
}

bool multi = 0;

int main(){

	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	
	int t = 1;
	if(multi) cin >> t;
	while(t--){
	
		solve();
	}

	return 0;
}