using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("How many items :");

        int items = int.Parse(Console.ReadLine());

        double sum=0 ;

        for(int i=1;i<=items;i++)

        {

Console.WriteLine("price of{0}=:",i);

            double price = double.Parse(Console.ReadLine());

            sum=sum+price ;

        }

        Console.WriteLine("Total="+sum);

        double d=0;

        if(sum>10000)

        {

        Console.WriteLine("discount="+d);

            d=(sum*20)/100;

​

        }

        else if (sum>1000)

        {

            Console.WriteLine(" discount="+d);

            d=(sum*10)/100;

        }

        else if (sum<=1000)

        {

            Console.WriteLine("discount="+d);

            d=sum;

        }

    }

}