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

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

    int start = (d*24+h)*60 + m;
    int end = (x+24)*24*60;
    if (x == 5) {
        if (start >= (29*24+2)*60) start -= 60;
        end += 23*60;
    }
    cout << end-start << '\n';
}