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

struct Time {
  int day, hour, minute;
};

Time round_to_finish(int round) {
  Time time;
  time.minute = 59;
  time.hour = 23;
  time.day = 23 + round + (round == 5);
  return time;
}

int time_to_minute(const Time& time) {
  int res = time.minute + 60*time.hour + 60*24*(time.day - 23);
  if (time.day == 29 && time.hour >= 3) {
    res -= 60;
  }
  return res;
}

int diff(const Time& start, const Time& finish) {
  return time_to_minute(finish) - time_to_minute(start) + 1;
}

int main() {
  int round;
  Time start;
  cin >> round >> start.day >> start.hour >> start.minute;
  Time finish = round_to_finish(round);
  cout << diff(start, finish) << "\n";
}