#include <iostream>
#include <cstdio>
using namespace std;
int main(){
   int N; double p;
   cin >> N >> p;
   double P[N+1];
   for(int i=2;i<=N;i++)P[i]=1.0;
   double ans=0;
   for(int i=2;i<=N;i++){
      ans+=P[i];
      for( int j=i+i; j<=N; j+=i ){
         P[j]*=(1-p);
      }
   }
   printf("%.10f\n",ans);
   return 0;
}