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#include <iostream>
#include <vector>

using namespace std;

int endDays[5] = {25, 26, 27, 28, 30};

int timeToMinutes(int day, int hour, int min) {
    if ((day == 29 && hour >= 3) || (day > 29)) {
        hour--;
    }
    hour += 24 * day;
    min += 60 * hour;
    return min;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int x, d, m, h;
    cin >> x >> d >> h >> m;
    cout << timeToMinutes(endDays[x - 1], 0, 0) - timeToMinutes(d, h, m);
}