#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<ll> VL;
typedef vector<VL> VVL;
typedef pair<int, int> PII;

#define FOR(i, a, n) for (ll i = (ll)a; i < (ll)n; ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(x) x.begin(), x.end()
#define MOD 1000000007
#define INF (1LL<<25)     //33554432
#define PI 3.14159265359
#define EPS 1e-12
//#define int ll

int a[1000010];
signed main(void)
{
  int n;
  double p;
  cin >> n >> p;

  FOR(i, 2, n+1)
    for(int j=i*2; j<=n; j+=i)
      a[j]++;
  double ans = 0;
  FOR(i, 2, n+1) {
    if(a[i] == 0) ans += 1;
    else ans += pow((1-p), a[i]);
  }

  cout << fixed << setprecision(15) << ans << endl;
  return 0;
}