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#include <iostream>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int x, d, h, m;
    cin >> x >> d >> h >> m;
    if (x == 5) x = 6;
    int res{};
    res += 60 * (23 - h) + (60 - m);
    if (d - x <= 22) {
        res += 24 * 60;
    }
    if (d - x <= 21) {
        res += 24 * 60;
    }
    if (x == 6 && (d == 27 || d == 28 || (d == 29 && h < 2))) {
        res -= 60;
    }
    cout << res << "\n";
}