#include<bits/stdc++.h>
using namespace std;
using Int = long long;

struct Precision{
  Precision(){
    cout<<fixed<<setprecision(12);
  }
}precision_beet;

//INSERT ABOVE HERE
signed main(){
  Int n;
  double p;
  cin>>n>>p;
  vector<double> dp(n+1,1);
  for(Int i=2;i<=n;i++)
    for(Int j=i+i;j<=n;j+=i)
      dp[j]*=dp[i]*(1.0-p)+(1.0-dp[i])*p;
  
  //for(Int i=2;i<=n;i++) cout<<i<<":"<<dp[i]<<endl;
  double ans=0;
  for(Int i=2;i<=n;i++) ans+=dp[i];
  cout<<ans<<endl;
  return 0;
}