#include <iostream.h>

int main () {

  const double express_pass_cost = 74.50,
               regular_pass_cost = 60.50,
               ticket_cost = 0.85;
  int express_rides, regular_rides;
  double regular_pass_total, ticket_total;

  cout << "Enter the number of express and regular rides expected: ";
  cin >> express_rides >> regular_rides;

  while ((express_rides != 0) || (regular_rides != 0)) {

    regular_pass_total = regular_pass_cost + (express_rides * ticket_cost);
    ticket_total = (express_rides * 3 * ticket_cost) +
                   (regular_rides * 2 * ticket_cost);

    if ((express_pass_cost <= regular_pass_total) &&
        (express_pass_cost <= ticket_total)) {

      cout << "An express pass is the cheapest option." << endl;

    } else if (regular_pass_total <= ticket_total) {

      cout << "A regular pass is the cheapest option." << endl;

    } else {

      cout << "Tickets are the cheapest option." << endl;

    }

    cout << "Enter the number of express and regular rides expected: ";
    cin >> express_rides >> regular_rides;

  }

  return 0; // could be omitted (would be assumed)

}