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();

		int[] d = new int[N+10];
		for(int i=2;i<=N;i++){
			for(int j=i*2;j<=N;j+=i){
				d[j]++;
			}
		}
		double e = 0;
		for(int i=2;i<=N;i++){
			if(d[i]==0) e+=1;
			else e+=Math.pow(1-p,d[i]);
		}
		System.out.println(e);
	}
}