using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("enter length");

        String s = Console.ReadLine();

        int length = 0;

        Console.WriteLine("enter width");

        String S = Console.ReadLine();

        int width = 0;

        if (int.TryParse(s, out length) && int.TryParse(S, out width))

        {

            length = Convert.ToInt32(s);

            width = Convert.ToInt32(S);

            int area = length*width;

            int fee = 0;

            if (area < 400)

                fee = 25;

            else if (area >= 400 && area < 600)

                fee = 35;

            else if (area >= 600)

                fee = 50;

            Console.WriteLine($"weekly fee {fee} \n total fee {fee*20}");

        }

        else

            Console.WriteLine("invalid");

    }

}