using System;

​

class TankOverflowException : Exception{

    public TankOverflowException(): base(String.Format("Tank is overflowing")){}

}

​

class TankFullException : Exception{

    public TankFullException(): base(String.Format("Tank is full")){}

}

​

class Tank{

    int tankCapacity;

    public Tank(int tankCapacity){

        this.tankCapacity=tankCapacity; 

    }

    public void takeInput(int input){

        this.tankCapacity-=input;

    }

    public int checkTankCapacity(){

        return this.tankCapacity;   

    }

}

​

public class Program

{

    public static void Main()

    {

        int fillVolume;

        Console.Write("Enter entire tank capacity : ");

        Tank tank=new Tank(Convert.ToInt32(Console.ReadLine()));

        try{

            while(tank.checkTankCapacity()>=0){

                if(tank.checkTankCapacity()==0){

                    throw new TankFullException();

                }else{

                    Console.Write("Enter volume to fill : ");

                    fillVolume=Convert.ToInt32(Console.ReadLine());

                    tank.takeInput(fillVolume);

                    Console.WriteLine("current tank input capacity : {0}",tank.checkTankCapacity());

                }

            }

            throw new TankOverflowException();

        }catch(TankFullException e){

            Console.WriteLine(e.Message);

        }catch(TankOverflowException e){

            Console.WriteLine(e.Message);

        }

    }

}