using System;

public class Program

{

    public static void Main()

    {

        { int bill_amount;

           Console.WriteLine("insert bill amount");

         if (bill_ammount>=20000)

         {

               bill_amount = bill_amount * 6 / 100;

               Console.WriteLine("Discount amount of bill is" + bill_amount);

           }

           else if (bill_amount < 20000 && bill_amount>=5000)

           {

               bill_amount = bill_amount * 4 / 100;

               Console.WriteLine("Discount amount of bill is" + bill_amount);

           }

           else if (bill_amount < 6000)

           {

               bill_amount = bill_amount * 2/ 100;

               Console.WriteLine("Discount amount of bill is" + bill_amount);

           }

        }

    }

}