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

int yaku[1234567];
using ld=long double;

signed main(){
  for(int i=2;i<1234567;i++)
    for(int j=i;j<1234567;j+=i)
      yaku[j]++;
  int n;ld p;cin>>n>>p;
  ld ans=0;
  for(int i=2;i<=n;i++)ans+=pow(1-p,yaku[i]-1);
  cout<<fixed<<setprecision(12)<<ans<<endl;
}