#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); i++)
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<ll> vll;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;
typedef vector<vector<ll>> vvll;
const ll inf = 1e16;
const ll md = 1000000007;

int main() {
  int n;
  double p;
  cin>>n>>p;
  vector<double> sp(n+1,1.);
  double ans=0;
  for(int a=2;a<=n;a++){
    ans+=sp[a];
    for(int b=a*2;b<=n;b+=a) sp[b]*=1-p;
  }
  printf("%.7f",ans);
  return 0;
}