using System;

class KlasaA  

{  

    virtual public int Uvecaj()  

    {  

        return 10;  

    }  

}  

class KlasaB : KlasaA  

{  

    override public int Uvecaj()  

    {  

        return 20 * base.Uvecaj();  

    }  

}  

​

class KlasaC : KlasaB

{  

    override public int Uvecaj()  

    {  

        return 50 + base.Uvecaj();

    }  

}  

public class Program

{

    public static void Main()

    {

        KlasaA a = new KlasaA(); Console.WriteLine(a.Uvecaj());

        KlasaA b = new KlasaB(); Console.WriteLine(b.Uvecaj());

        KlasaA c = new KlasaC(); Console.WriteLine(c.Uvecaj());

​

    }

}