/* -*- coding: utf-8 -*-
 *
 * 144.cc: No.144 エラトステネスのざる - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 1000000;

/* typedef */

/* global variables */

int ds[MAX_N + 1];

/* subroutines */

/* main */

int main() {
  int n;
  double p;
  cin >> n >> p;

  for (int i = 2; i <= n; i++)
    for (int j = 2 * i; j <= n; j += i) ds[j]++;

  double mp = 1.0 - p;
  double sum = 0.0;
  for (int i = 2; i <= n; i++) sum += pow(mp, (double)ds[i]);

  printf("%.8lf\n", sum);
  return 0;
}