using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Engineer en = new Engineer(){ MonthlySalary = 1500 };

        Console.WriteLine("Engineer salary: $" + en.GetPaymentAmount());

    }

}

​

public abstract class Employee

{

    public double MonthlySalary { get; set; }

    public double Commission { get; set; }

    public double Bonus { get; set; }

​

    public abstract int GetPaymentAmount();

}

​

public class Engineer:Employee

{

    public override int GetPaymentAmount()

    {

        return (int) MonthlySalary;

    }

}

​

public class Salesman:Employee

{

    public override int GetPaymentAmount()

    {

        return (int) MonthlySalary + Commission;

    }

}

​

public class Manager:Employee

{

    public override int GetPaymentAmount()

    {

        return (int) MonthlySalary + Bonus;

    }

}