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#include <bits/stdc++.h>

using namespace std;

int main(){
    cin.tie(0)->sync_with_stdio(0);

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

    int endDay = x == 5 ? 29 : x + 23;

    int days = endDay - d;

    int time = days * 24 * 60 + (24 - h - 1) * 60 + 60 - m;
    if(x == 5 && (d < 29 || h < 2))time -= 60;
    cout << time << endl;

    return 0;
}