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#include <iostream>

using namespace std;

int ONE_HOUR_MINUTES = 60;
int WHOLE_DAY_MINUTES = 24 * ONE_HOUR_MINUTES;
int deadlines[5] = {
    2 * WHOLE_DAY_MINUTES,
    3 * WHOLE_DAY_MINUTES,
    4 * WHOLE_DAY_MINUTES,
    5 * WHOLE_DAY_MINUTES,
    7 * WHOLE_DAY_MINUTES - ONE_HOUR_MINUTES
    };

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int x, d, h, m;
    cin >> x >> d >> h >> m;
    d -= 23;
    int time = d * WHOLE_DAY_MINUTES + h * ONE_HOUR_MINUTES + m;
    if (d == 6 && h > 2) {
        time -= ONE_HOUR_MINUTES;
    }
    int deadline = deadlines[x - 1];
    cout << deadline - time << "\n";
}