#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define Int long long

int main() {
  int N;
  double p;
  cin >> N >> p;
  vector<int> cnt(N + 1);
  double ans = 0;
  for (int i = 2; i <= N; i++) {
    for (int m = i; m <= N; m += i) {
      cnt[m]++;
    }
    ans += pow(1 - p, cnt[i] - 1);
  }
  cout << fixed << setprecision(10) << ans << endl;
}