using System;
using System.Text;
using System.Linq;
using System.Collections.Generic;

public class Program
{
    public void Proc() {
        Reader.IsDebug = false;
        decimal baseNum = 100m/3;
        int[] inpt = Reader.ReadLine().Split(' ').Select(a=>int.Parse(a)).ToArray();

        this.p0 =inpt[0];
        this.q = inpt[1];

        decimal ans = this.GetAns( baseNum, (decimal)p0) + baseNum;
        Console.WriteLine(ans/100);
    }

    private decimal GetAns(decimal current, decimal p1) {
        if((current < 1/100000000000m)) {
            return current;
        }
        decimal useHissyo = current * p1 / 100;
        decimal ans = 0;
        if(useHissyo > 0) {
            ans += useHissyo / 2;
            ans += GetAns(useHissyo / 2, Math.Max(p1-q, 0));
        }
        ans += (current - useHissyo) / 3;
        ans += GetAns((current-useHissyo)/3, Math.Min(p1+q, 100));
        return ans;
    
    }

    private int p0;
    private int q;


    public class Reader {
        public static bool IsDebug = true;
        private static System.IO.StringReader SReader;
        private static string InitText = @"

0 0

";
        public static string ReadLine() {
            if(IsDebug) {
                if(SReader == null) {
                    SReader = new System.IO.StringReader(InitText.Trim());
                }
                return SReader.ReadLine();
            } else {
                return Console.ReadLine();
            }
        }
    }
    public static void Main(string[] args)
    {
        Program prg = new Program();
        prg.Proc();
    }
}