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

class TEST{
	static void Main(){
		Sol mySol =new Sol();
		mySol.Solve();
	}
}

class Sol{
	public void Solve(){
		double[] P=new double[N+1];
		for(int i=2;i<=N;i++)P[i]=1.0;
		P[0]=P[1]=0.0;
		
		for(int i=2;i<=N;i++){
			double alive=(1-p);
			for(int j=i+i;j<=N;j+=i)P[j]*=alive;
		}
		Console.WriteLine(P.Sum());
		
		
		
	}
	int N;
	double p;
	public Sol(){
		var d=rsa();
		N=int.Parse(d[0]);
		p=double.Parse(d[1]);
	}




	static String rs(){return Console.ReadLine();}
	static int ri(){return int.Parse(Console.ReadLine());}
	static long rl(){return long.Parse(Console.ReadLine());}
	static double rd(){return double.Parse(Console.ReadLine());}
	static String[] rsa(){return Console.ReadLine().Split(' ');}
	static int[] ria(){return Array.ConvertAll(Console.ReadLine().Split(' '),e=>int.Parse(e));}
	static long[] rla(){return Array.ConvertAll(Console.ReadLine().Split(' '),e=>long.Parse(e));}
	static double[] rda(){return Array.ConvertAll(Console.ReadLine().Split(' '),e=>double.Parse(e));}
}