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#include <iostream>
using namespace std;

int main() {
    int x, d, h, m; cin >> x >> d >> h >> m;
    int res = 0;
    if (x < 5) {
        res = ((x + 24 - d) * 24 - h) * 60 - m;
    } else {
        res = ((x + 25 - d) * 24 - h) * 60 - m;
        if (d < 29 || (d == 29 && h < 2)) res -= 60;
    }
    cout << res << '\n';
    return 0;
}
/*

1 23 12 30

5 28 13 14

3 25 12 30

*/