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//fast
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;

#define all(x) x.begin(),x.end()
#define rep(n) for (int i = 0 ; i<n ; i++)
#define pb push_back

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
	int x,d,g,m;
	cin >> x >> d >> g >> m;
	if (x!=5){
		int cd = 23+x;
		cout << (cd-d)*24*60+(24-g-1)*60+(60-m) << '\n';
		return 0;
	}
	int cd = 29;
	int w = (cd-d)*24*60+(24-g-1)*60+(60-m)-60;
	if (d==29 && g>=3) w+=60;
	cout << w << '\n';
}