#include <bits/stdc++.h>
using namespace std;
#define INF 1000000000000000000
using ll=long long;
using Graph=vector<vector<int>>;

int main(){
  int N;
  double p;
  cin>>N>>p;
  vector<double> prob(N+1,1.0);
  prob[0]=0.0;
  prob[1]=0.0;
  double ans=0.0;
  for(int i=2;i<=N;i++){
    ans+=prob[i];
    for(int j=2;j<=N/i;j++){
      prob[i*j]*=(1.0-p);
    }
  }

  printf("%.6lf\n",ans);
}