import java.util.*;

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