class TestMotorcycle : Motorcycle
{
 
    public override double GetTopSpeed()
    {
        return 108.4;
    }
 
    static void Main()
    {
        
        TestMotorcycle moto = new TestMotorcycle();
 
        moto.StartEngine();
        moto.AddGas(15);
        moto.Drive(5, 20);
        double speed = moto.GetTopSpeed();
        Console.WriteLine("My top speed is {0}", speed);            
    }
}