#include <bits/stdc++.h>

using namespace std;

vector<int> count_divisor(int n) {
  vector<int> c(n + 1);
  for (int i = 1; i <= n; ++i) {
    for (int j = i; j <= n; j += i) ++c[j];
  }
  return c;
}

int main() {
  int n;
  double p, res = 0;
  cin >> n >> p;
  auto c = count_divisor(n);
  for (int i = 2; i <= n; ++i) res += pow(1 - p, c[i] - 2);
  cout << fixed << setprecision(15) << res << endl;
}