using System;
using System.Collections.Generic;

class Program
{
    static string InputPattern = "InputX";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("10 1.00000");
            //4
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("10 0.00000");
            //9
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("10 0.50000");
            //5.75
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static void Main()
    {
        List<string> InputList = GetInputList();
        string[] wkArr = InputList[0].Split(' ');

        int N = int.Parse(wkArr[0]);
        double p = double.Parse(wkArr[1]);

        //自分以外の約数の個数の配列
        int[] YakusuuCntArr = new int[N + 1];
        for (int I = 2; I * 2 <= N; I++) {
            for (int J = I * 2; J <= N; J += I) {
                YakusuuCntArr[J]++;
            }
        }

        //for (int I = 2; I <= N; I++) {
        //    Console.WriteLine("YakusuuCntArr[{0}]={1}", I, YakusuuCntArr[I]);
        //}

        //期待値の加法性を使って、期待値を計算
        double Answer = 0;
        for (int I = 2; I <= N; I++) {
            if (YakusuuCntArr[I] == 0) Answer++;
            else {
                //確率の乗法定理
                Answer += Math.Pow(1 - p, YakusuuCntArr[I]);
            }
        }
        Console.WriteLine(Answer);
    }
}