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#include <iostream>

using namespace std;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int x, d, h, m;
    int res = 0;
    cin >> x >> d >> h >> m;
    
    int d_left = 23 - d + x;
    int h_left = 23 - h;
    int m_left = 60 - m;

    if (x == 5) {
        d_left++;
        if (d < 29 || h < 2) {
            h_left--;
        }
    }

    res += d_left * 1440;
    res += h_left * 60;
    res += m_left;

    cout << res;

    return 0;
}