#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n;
	cin >> n;
	double p;
	cin >> p;
	vector<int> a(n + 1);
	for (int i = 1; i <= n; i++) {
		for (int j = i; j <= n; j += i) {
			a[j]++;
		}
	}
	for (int i = 2; i <= n; i++) {
		cerr << i << " " << a[i] << endl;
	}
	double ans = 0;
	for (int i = 2; i <= n; i++) {
		ans += pow(1.0 - p, a[i] - 2);
	}
	cout << setprecision(20) << fixed << ans << '\n';
	return 0;
}