using System;

public class Program

{

    public static void Main()

    {

        Carriage carriages1 = new Carriage(1,20);

        Carriage carriages2 = new Carriage(2,15);

        Train train = new Train(100);

        train.AddCarriage(carriages1);

        train.AddCarriage(carriages2);

        Console.WriteLine("empty carriages: "+ Train.CountEmpty(train));

        Console.WriteLine("Carriage 1 is full "+carriages1.IsFull());

        Console.WriteLine("Carriage 2 is full "+carriages2.IsFull());

    }

}

public class Carriage

{

    private int number;

    private int capacity;

    private int passengers;

    public Carriage(int number, int capacity)

    {

        this.number=number;

        this.capacity=capacity;

        this.passengers=0;

    }

    public int GetNumber()

    {

        return number;

    }

    public void SetNumber(int number)

    {

        this.number = number;

    }

    public int GetCapacity()

    {

        return capacity;

    }

    public void SetCapacity(int capacity1)

    {

        capacity=capacity1;

    }

    public int GetPassengers()

    {

        return passengers;

    }

    public void SetPassengers(int passenger)

    {

        this.passengers=passenger;

    }

    public bool IsFull()

    {

        return passengers == capacity;

    }

}

public class Train

{

    private int number;

    private Carriage[] carriages;

    private int counter;

    public Train (int number)

    {

        this.number=number;

        carriages=new Carriage[10];

        counter=0;

    }

    public void AddCarriage(Carriage c)

    {

        if(counter<10)

        {

            carriages[counter]=c;

            counter++;

            Console.WriteLine("carriages added to train.");

        }

        else

        {

            Console.WriteLine("train already full cant add more carriages");

        }

    }

    public static int CountEmpty(Train train)

    {

        int count=0;

        for(int i=0; i<train.carriages.Length;i++)

        {

            Carriage c = train.carriages[i];

            if(c != null && !c.IsFull())

            {

                count++;

            }

        }

        return count;

    }

}