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

double dp[1000001];

int main() {
	int n;
	cin >> n;
	double p;
	cin >> p;

	dp[0] = 1;
	for (int i = 1;i <= 1000000;i++) {
		dp[i] = (1 - p)*dp[i - 1];
	}
	
	double ans = 0;
	for (int i = 2;i <= n;i++) {
		int num = 1;
		int x = i;
		multiset<int> set;
		for (int j = 2;j*j <= x;j++) {
			while (x%j == 0&&j*j<=x) {
				x /= j;
				set.insert(j);
			}
		}
		set.insert(x);
		while (!set.empty()) {
			num *= set.erase(*set.begin()) + 1;
		}
		ans += dp[num - 2];
	}

	cout << setprecision(9)<<ans << endl;
	return 0;
}