package no144;

import java.util.Arrays;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		double p = sc.nextDouble();
		double[] isPrime = new double[n+1];
		Arrays.fill(isPrime, 1.0D);
		double ans = 0;
		for(int i=2;i<=n;i++) {
			ans += isPrime[i];
			for(int j=i*2;j<=n;j+=i) {
				isPrime[j] *= (1-p);
			}
		}
		System.out.println(ans);
	}

}