using System;

public class Program

{

    public static void Main()

    {

        double total,price,discount,promotion;

        char ch;

        Console.Write("Input total price :");

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

        Console.Write("Do you have coupon [y/Y] :");

        ch = char.Parse(Console.ReadLine());

        Console.WriteLine("---------------------------------");

        if (ch == 'y' || ch == 'Y')

        {

            Console.Write("How many discount <%> :");

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

            discount = discount/100*price;

            total = price - discount;

            Console.Write("Discount from coupon <15%> = {0:n} Baht\n",discount);

        }

        else if (price >= 2000)

        {

            discount = 0.10;

            promotion = price*discount;

            total = price-price*discount;

            Console.Write("discount from promotin = {0:n} Baht\n",promotion);

        }

        else

            total = price;

            Console.WriteLine("Net price = {0:n} Baht",total);

    }

}