using System;

​

public class Program

{

    public static void Main()

    {

        int distance1 = int.Parse(Console.ReadLine());

        int distance2 = int.Parse(Console.ReadLine());

        int length1 = distance1 / 1000;

        int length2 = distance2 / 1000;

        int firmprice1 = 4;

        double firmprice2 = 0.90 + (1 * 0.90);

        double firm2 = 1 + (3 * 0.85);

        double sum = firmprice2 + firm2;

        if (distance1 < 1000)

        {

        }

        else if (distance1 < 5000)

        {

        }

        else if (distance1 < 2000)

        {

        }

        Console.WriteLine(sum);

    }

}