#include <iostream>
using namespace std;
 
class Airplane {
   public:
      Airplane();
      void AddPassengers(int passengers);
      int GetAvailableSeats() const;
   private:
      int totalSeats;
      int passengers;
};
 
Airplane::Airplane() {
   totalSeats = 200;
   passengers = 0;
}
 
void Airplane::AddPassengers(int passengers) {
   this->passengers = this->passengers + passengers;
}
 
int Airplane::GetAvailableSeats() const {
   return totalSeats - passengers;
}
 
int main() {
   Airplane airbus330;
 
   airbus330.AddPassengers(7);
   airbus330.AddPassengers(10);
 
   cout << airbus330.GetAvailableSeats() << " seats" << endl;
 
   return 0;
}

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