using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Berapa kotak?");

        // masuk data

        if (kotak 20......)

        {

            //kira harga

        }

        else if ( kotak 50......)

        {

            //kira harga

        }

        else if ( kotak 100.....)

        {

            //kira harga

        }

        else if ( kotak 200......)

        {

            //kira harga

        }

        //Tunjuk harga

        Console.WriteLine("Proceed or not>");

        // masuk data lagi

        if (yes)

        {

            //Tanya east ka west

            Console.WriteLine("East or west???");

            // masuk data lagi

            if (east)

            {

                //kira harga

                //Tunjuk harga baru

                Console.WriteLine("Proceed or not>");

                // masuk data lagi

                if (yes)

                {

                    //Thank you for purchase

                }

                if (no)

                {

                    //Thank you for interest

                }

            }

            else if (west)

            {

                //kira harga

                //Tunjuk harga baru

                Console.WriteLine("Proceed or not>");

                // masuk data lagi

                if (yes)

                {

                    //Thank you for purchase

                }

                if (no)

                {

                    //Thank you for interest

                }

            }

        }

        else if (no)

        {

            //Thank you for interest

        }

    }

}