package yukicoder;

import java.util.Scanner;

public class Q144 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		double p = sc.nextDouble();
		double[] pro = new double[n + 1];
		for (int i = 2; i <= n; ++i) {
			pro[i] = 1;
		}
		for (int i = 2; i <= n; ++i) {
			for (int j = 2 * i; j <= n; j += i) {
				pro[j] = pro[j] * (1 - p);
			}
		} 
		double ans = 0;
		for (int i = 2; i <= n; ++i) {
			ans += pro[i];
		}
		System.out.println(ans);

	}
}