using System;

public class Program

{

    public static void Main()

    {

        int length1;

        int width1;

        Console.WriteLine(" Enter length");

        string length = Console.ReadLine();

            bool success = int.TryParse(length, out length1);

        if (success)

            {

            Console.WriteLine(" Enter width");

        string width = Console.ReadLine();

            bool success1 = int.TryParse(width, out width1);

            int squareFeet = width1 * length1;

            switch(squareFeet)

            {

            case  < 400:

                Console.WriteLine("your fee is $25 and your fee is $500");

                    break;

                case < 600 :

                    Console.WriteLine("your fee is $35 and your total is $700");

                    break;

                case > 600 :

                Console.WriteLine("your fee is %50 and your total is $1000");

                break;

            }

        }

        else{

        Console.WriteLine("enter a real integer");

        }

    }   

}