#include <iostream>
#include <sstream>
#include <string>
#include <vector>
#include <list>
#include <stack>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <algorithm>
#include <functional>
#include <limits>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <climits>
#include <complex>

using namespace std;

#define INF (INT_MAX/3)
#define PI (2*acos(0.0))
#define EPS (1e-8)

typedef long long ll;
typedef unsigned long long ull;

int a[1000001];

int main(){
  ios_base::sync_with_stdio(0);
  int N;  double P;
  cin >> N >> P;
  for(int i = 2; i <= N; i++){
    for(int j = i * 2; j <= N; j += i) a[j]++;
  }
  double e = 0;
  for(int i = 2; i <= N; i++){
    if(a[i] == 0) e += 1;
    else e += pow(1 - P, a[i]);
  }
  printf("%.10f\n", e);
  return 0;
}