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#include <bits/stdc++.h>

using namespace std;

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

    int x, d, h, m;
    cin >> x >> d >> h >> m;

    if (x < 5)
    {
        int answer = (23 + x - d) * 24 * 60 + (23 - h) * 60 + 60 - m;

        cout << answer << '\n';
    }
    else
    {
        int answer = (29 - d) * 24 * 60 + (23 - h) * 60 + 60 - m;

        if (d < 29 || h < 2) answer -= 60;

        cout << answer << '\n';
    }
}