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

namespace yukicoder
{
    public class Program
    {
        public static void Main()
        {
            var line = Console.ReadLine().Split(' ');
            var n = int.Parse(line[0]);
            var p = double.Parse(line[1]);
            double sum = 0;
            for(var i = 2; i <= n; i++)
            {
                var m = Math.Pow((1 - p), Divisor(i).Count());
                sum += m;
            }
            Console.WriteLine(sum);
        }
        public static IEnumerable<int> Divisor(int n)
        {
            for(var i = 2; i * i <= n; i++)
            {
                if (n % i == 0)
                {
                    yield return i;
                    if (i * i != n)
                    {
                        yield return n / i;
                    }
                }
            }
        }
    }
}