using System;

public class Program

{

    public static void Main()

    {

        var NissesBil = new Bil();

        NissesBil.SetHP(10);

        var KallesBil = NissesBil;

        KallesBil.SetHP(100);

        Console.WriteLine("Kalles bil " + KallesBil.horsepower);

        Console.WriteLine("Nisses bil " + NissesBil.horsepower);

    }

    class Bil {

        public int horsepower = 0;

        public void SetHP(int hp){

            this.horsepower = hp;

        }

    }

}