using System;

public class Program

{

     public struct paket{

        int poruka;

    public class kurs{

        int cena;

        paket paket;

    public static void Main()

    {

        try{

            kurs k1=null; kurs k2=null;

            try{

                k1=new kurs();

                k1.cena=Convert.ToInt32('0');

        }

            catch(FormatException){Console.Write('4');}

            finally{Console.Write('5');}

            Console.Write(k1.paket.poruka);

            k2.cena=100/int.Parse("0");

            Console.Write(k2.cena);

    }

        catch(NullReferenceException){Console.Write('6');}

        catch(DivideByZeroException){Console.Write('7');}

        catch(Exception){Console.Write('8');}

        finally{Console.Write('9');}

}

    }

}

}