using System;

public class Program

{

    public static void Main()

    {

        start: 

        Console.WriteLine("Hi there! Welcome to our online electronics sale.");

        Console.WriteLine("How many ps5 would you like to buy?");

        byte num1 = byte.Parse(Console.ReadLine());

        Console.WriteLine("How many Gaming pc would you like to buy?");

        byte num2 = byte.Parse(Console.ReadLine());

        Console.WriteLine("How many monitors would you like to buy?");

            byte num3 = byte.Parse(Console.ReadLine());

        Console.WriteLine("How many gaming chairs would you like to buy?");

    byte num4 = byte.Parse(Console.ReadLine());       

decimal cost1 = num1 * 74.99M;

decimal cost2 = num2 * 199.99M;

decimal cost3 = num3 * 34.99M;

decimal cost4 = num4 * 19.99M;

decimal subtotal = cost1 +cost2 + cost3 + cost4;

        Console.Clear();

    decimal shipping;

    if(subtotal > 0 && subtotal <= 50)

        {

            shipping = 7.99M;

            Console.WriteLine("You're shipping cost is $7.99");

        }

        else if (subtotal > 50 && subtotal <= 100)

        { 

            shipping = 9.99M;

            Console.WriteLine("You're shipping cost is $9.99");

        }

        else if (subtotal > 100)

        {

            shipping = 0M;

            Console.WriteLine("You're shipping cost is $0");

        }

        else

        {

            shipping = 0M;

            Console.WriteLine("Please enter a valid amount");

        }

        decimal tax = subtotal * .08265M;

            decimal grand = tax + shipping + subtotal;

    Console.WriteLine("Your grand total is " + grand + ".");

        Console.WriteLine("Would you like to continue shopping, Yes/No?");

        string choice = Console.ReadLine();

        if (choice =="y" || choice == "Y")

        {Console.Clear();

         goto start;

        }

    }

}