#include <iostream>
#include <cstdio>
using namespace std;
double tbl[1000010];
int main(){
  int n;
  double p;
  cin >> n >> p;
  for(int i=2;i<=n;++i) tbl[i] = 1.0;
  double s = 0;
  for(int i=2;i*2<=n;++i){
    for(int j=2;i*j<=n;++j) tbl[i*j]*=1-p;
  }
  for(int i=2;i<=n;++i) s+=tbl[i];
  printf("%.10lf\n",s);

  return 0;
}