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

class Magatro
{
    const int MAX = 1000000;
    static int N;
    static double p;
    static int[] D = new int[MAX+1];
    static void Main()
    {       
        for (int i = 2; i <= MAX; i++) for (int j = i + i; j <= MAX; j += i) D[j]++;
        string[] S = Console.ReadLine().Split(' ');
        N = int.Parse(S[0]);
         p = double.Parse(S[1]);
        double ans = 0;
        for(int i = 2; i <= N; i++)
        {
            ans += P(i);
        }
        Console.WriteLine(ans);

    }
    static double P(int i)
    {
        return Math.Pow(1.0 - p, D[i]);
    }

}