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#include <bits/stdc++.h>
using namespace std;

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

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

    if (x <= 4) {
        int end = ((23 + x) * 24 + 23) * 60 + 59 + 1;
        int cur = ((d * 24) + h) * 60 + m;
        cout << end - cur << "\n";
    }
    else {
        int end = ((23 + x + 1) * 24 + 23) * 60 + 59 + 1;
        int cur = ((d * 24) + h) * 60 + m;
        int pen = (d <= 28 || (d == 29 && h < 2)) * 60;
        cout << end - cur - pen << "\n";
    }
}