#include <bits/stdc++.h>
// #include <atcoder/modint>
#define rng(a) a.begin(),a.end()
#define rrng(a) a.rbegin(),a.rend()
#define INF 2000000000000000000
#define ll long long
#define ld long double
#define pll pair<ll, ll>
using namespace std;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  ll N;
  ld P;
  cin >> N >> P;
  vector<ll> num(N + 1, 0);
  for (ll i = 2; i <= N; ++i) {
    ll cnt = 2;
    while (cnt * i <= N) {
      num.at(cnt * i) += 1;
      cnt += 1;
    }
  }
  ld ans = 0;
  for (ll i = 2; i <= N; ++i) {
    ans += 1 * pow(1.0 - P, num.at(i));
  }
  cout << fixed << setprecision(15);
  cout << ans << "\n";
}