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

int main()
{
	int n;
	cin >> n;
	double p;
	cin >> p;
	vector<int> div(n+1);
	for(int i = 2;i<=n;i++)
	{
		for(int j = i;j<=n;j+=i)
		{
			div[j]++;
		}
	}
	double ans = 0;
	for(int i = 2;i<=n;i++)
	{
		ans += pow(1-p,div[i]-1);
	}
	printf("%.10lf\n",ans);
	return 0;
}