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#include <bits/stdc++.h>

using namespace std;

int r, d, h, m;
int Ans;

int main()
{
    cin >> r >> d >> h >> m;
    if(r < 5) {Ans = (36 - (h - 12) - ((d - r - 22) * 24)) * 60 - m;}
    else {
        if(d == 29 and h > 2) Ans = (24 - h) * 60 - m;
        else Ans = (36 - (h - 12) - ((d - r - 22) * 24)) * 60 - m + (23 * 60);
    }
    cout << Ans << "\n";
}