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#include<iostream>
using namespace std;

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int x{}, d{}, h{}, m{};
  cin >> x >> d >> h >> m;
  if(x <= 4) {
    int minutes = (24 - (h+1))*60 + (60-m) + (23+x-d)*1440;
    cout << minutes << '\n';
  }
  else {
    int minutes = (24 - (h+1))*60 + (60-m) + (24+x-d)*1440;
    if(d < 29 || (d == 29 && h < 2)) minutes -= 60;
    cout << minutes << '\n';
  }
}