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#include <iostream>
using namespace std;

int to_minutes(int d, int h, int m) {
    int base = (d - 23) * 24 * 60 + h * 60 + m;
    if (d > 29 || (d == 29 && h >= 3)) base -= 60;
    return base;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int x, d, h, m;
    cin >> x >> d >> h >> m;

    int deadline[] = {0, 25, 26, 27, 28, 30};

    cout << to_minutes(deadline[x], 0, 0) - to_minutes(d, h, m) << "\n";
    return 0;
}