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#include <iostream>
using namespace std;
int main() {
  const int D = 24 * 60;
  const int H = 60;
  const int M = 1;
  long long x, d, h, m;
  long long time = 0;
  cin >> x >> d >> h >> m;
  time = d * D + h * H + m * M;
  switch (x) {
  case 1:
    cout << 25 * D - time;
    break;
  case 2:
    cout << 26 * D - time;
    break;
  case 3:
    cout << 27 * D - time;
    break;
  case 4:
    cout << 28 * D - time;
    break;
  case 5:
    if (time < 29 * D + 2 * H) {
      time += H;
    }
    cout << 30 * D - time;
    break;
  }
}