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#include <iostream>
using namespace std;

int main() {
    ios_base::sync_with_stdio(0);

    int x, d, h, m;

    cin >> x >> d >> h >> m;

    if (x < 5) {
        cout << (23 + x - d) * 24 * 60 + (23 - h) * 60 + 60 - m << endl;
    } else {
        int result = (29 - d) * 24 * 60 + (23 - h) * 60 + 60 - m;
        if (d < 29 || d == 29 && h < 2) {
            result-=60;
        }
        cout << result << endl;
    }
}