#include<bits/stdc++.h>

using namespace std;
using ll = long long;


int main()
{
	int n;
	double p;
	cin >> n >> p;
	p = 1.0 - p;
	vector<double> ps(n + 1, 1.0);
	ps[0] = ps[1] = 0;
	for(int i = 2; i <= n; i++) {
		for(int j = i + i; j <= n; j += i) {
			ps[j] *= p;
		}
	}
	// print(ps);
	// for(int i = 0; i <= n; i++)cerr << i << ": " << ps[i] << endl;

	cout << fixed <<setprecision(12) <<  accumulate(ps.begin(), ps.end(), 0.0) << endl; 
}