#include <iostream>
#include <iomanip>
#include <vector>
using namespace std;

int main(){
	int n;
	double p;
	cin>>n>>p;
	vector<double> candidate(n+1,1.0);
	double ans=0;
	for(int i=2;i<=n;i++){
		if (candidate[i]<0) continue;
		ans+=candidate[i];
		int next_cur=i*2;
		while(next_cur<=n){
			candidate[next_cur]*=(1-p);
			next_cur+=i;
		}
	}
	cout<<fixed<<setprecision(10);
	cout<<ans<<endl;
	return 0;
}