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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;
    if (!(cin >> x >> d >> h >> m)) return 0;
    int start_mins = (d - 23) * 24 * 60 + h * 60 + m;
    if (d == 29 && h >= 3)
        start_mins -= 60;
    int end_day[] = {0, 25, 26, 27, 28, 30};
    int end_mins = (end_day[x] - 23) * 24 * 60;
    if (end_day[x] >= 30)
        end_mins -= 60;
    cout << end_mins - start_mins << "\n";
    return 0;
}