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#include <iostream>


int main() {
    int x, d, h, m;
    std::cin >> x >> d >> h >> m;


    int days;
    int hours;
    int minutes;
    if (x == 5) {
        days = 29 - d;
        hours = 24 - (h + 1);
        minutes = 60 - m;
        if (d < 29 || h < 2) {
            hours -= 1;
        }
    }
    else {
        days = (x + 23) - d; // eg. x = 1 --> 24 - d
        hours = 24 - (h + 1);
        minutes = 60 - m;
    }
    std::cout << days * 24 * 60 + hours * 60 + minutes << '\n';
}