using System;

​

public class Program

{

    public void Main()

    {

        Car car = new Car();

        //car.GetMaxSpeed().Dump();

        BudgetCar budgetCar = new BudgetCar();

        //budgetCar.GetMaxSpeed().Dump();

        SuperCar superCar = new SuperCar();

        //superCar.GetMaxSpeed().Dump();

        Car superCarAsCar = new SuperCar();

        //superCarAsCar.GetMaxSpeed().Dump();

    }

}

​

class Car

{

    public virtual int GetMaxSpeed()

    {

        return 100;

    }

}

​

class BudgetCar : Car

{

}

​

class SuperCar : Car

{

    public override int GetMaxSpeed()

    {

        return 300;

    }

}