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

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int N = scan.nextInt();
		double p = scan.nextDouble();
		scan.close();
		int []list = new int[N + 1];
		Arrays.fill(list, 0);
		double ans = 0;
		for(int i = 2; i <= N; i++) {
			for(int j = 2; j <= N / i; j++) {
				list[i * j] ++;
			}
		}
		for(int i = 2; i <= N; i++) {
			if(list[i] == 0) {
				ans ++;
			}else {
				ans += 1.0 * Math.pow((1 - p), list[i]);
			}
		}
		System.out.println(ans);
	}
}