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

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

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

    int mins1 = (d-23)*24*60 + h*60 + m;
    if (x == 5 && mins1 < 6*24*60 + 2*60)
        mins1 += 60;
    int mins2;
    if (x <= 4)
        mins2 = (x+1)*24*60;
    else
        mins2 = 7*24*60;

    int ans = mins2-mins1;
    cout << ans;
}