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

const int DOBA = 1440;

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

    int x, d, h, m;
    cin >> x >> d >> h >> m;

    vector<int> koniec = {0, 24, 25, 26, 27, 29};

    int cur_minuty = h * 60 + m;
    int polnoc = DOBA - cur_minuty;

    if(x < 5) {
        if(koniec[x] != d) {
            polnoc += DOBA;
        }
        cout << polnoc << '\n';
    }
    else {
        int dist = koniec[x] - d;
        polnoc += dist * DOBA;

        if(d <= 28 || h == 0 || h == 1) {
            polnoc -= 60;
        }
        cout << polnoc << '\n';
    }
}