using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace LawnMowing

{

    internal class Program

    {

        static void Main(string[] args)

        {

            int length;

            int width;

            getValidInt("Input Length: ", "Error: Not an Integer", out length);

            getValidInt("Input Width: ", "Error: Not An Integer", out width);

            int price = findLawnPrice(width, length);

​

            Console.WriteLine($"The weekly mowing fee is {price:C}");

            Console.WriteLine($"The total fee is {price * 20:C}");

        }

​

        static void getValidInt(String inputMessage, String errorMessage, out int value)

        {

            while(true)

            {

                Console.Write(inputMessage);

                if(int.TryParse(Console.ReadLine(), out value))

                {

                    return;

                }

                Console.WriteLine(errorMessage);

            }

        }

​

        static int findLawnPrice(int width, int length)

        {

            int area = width * length;

​

            if(area < 400)

            {

                return 25;

            } else if(area < 600)

            {

                return 35;

            } else

            {

                return 50;

            }

        }

    }

}

​