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

int to_minutes(int d, int h, int m) {
    return (d - 23) * 24 * 60 + h * 60 + m;
}

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

    int end_day[6] = {0, 24, 25, 26, 27, 29};

    int start = to_minutes(d, h, m);
    int end = to_minutes(end_day[x], 23, 59) + 1;

    int ans = end - start;

    int zmiana = to_minutes(29, 2, 0);

    if (start <= zmiana && zmiana < end) ans -= 60;

    cout << ans;
    return 0;
}