#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);
	for (int i = 2; i <= n; i++) {
		int x = i;
		int c = 0;
		for (int j = 1; j * j <= x; j++) {
			if (x % j == 0) {
				if (x / j == j) c++;
				else c += 2;
			}
		}
		a[i] = c;
	}
	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;
}