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#include <iostream>

using namespace std;

int main() {
    int x, d, h, m;
    cin >> x >> d >> h >> m;
    
    int dzien_konca = (x == 5) ? 29 : 23 + x;

    int minuty = (23 - h) * 60 + (60 - m);

    for (int i = d + 1; i <= dzien_konca; ++i) {
        minuty += 1440;
    }
    
    if (x == 5) {
        if (d < 29 || (d == 29 && h < 2)) {
            minuty -= 60;
        }
    }

    cout << minuty << endl;

    return 0;
}