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#include <iostream>

using namespace std;

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

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

    int end_d = (r >= 1 && r <= 4) ? 23 + r : 29;
    long long sum = 0;

    int current_day_mins = (24 * 60) - (h * 60 + m);
    if (d == 29 && h < 2) {
        current_day_mins -= 60;
    }
    sum += current_day_mins;

    for (int i = d + 1; i <= end_d; ++i) {
        if (i == 29) {
            sum += 23 * 60;
        } else {
            sum += 24 * 60;
        }
    }

    cout << sum << endl;

    return 0;
}