#include <bits/stdc++.h>

#define M_PI       3.14159265358979323846   // pi

using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<ll> VI;
typedef pair<ll, ll> P;
typedef tuple<ll, ll, ll> t3;
typedef tuple<ll, ll, ll, ll> t4;

#define rep(a,n) for(ll a = 0;a < n;a++)
#define repi(a,b,n) for(ll a = b;a < n;a++)

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

template<typename T>
void chmax(T& reference, T value) {
	reference = max(reference, value);
}

template<typename T>
void chmin(T& reference, T value) {
	reference = min(reference, value);
}
constexpr double mpow(double x, ll n) {
	double ans = 1;
	while (n != 0) {
		if (n & 1) ans = ans * x;
		x = x * x;
		n = n >> 1;
	}
	return ans;
}

int main() {
	ll n;
	double p;
	cin >> n >> p;
	vector<int> table(n + 1, 0);
	for (int i = 2; i <= n; i++) {
		for (int j = 1; i * j <= n; j++) {
			table[i * j]++;
		}
	}
	double ex = 0;
	for (int i = 2; i <= n; i++) {
		int c = table[i];
		double q = mpow(1-p, c - 1);
		ex += q;
	}
	cout << setprecision(10) << fixed << ex << endl;
	return 0;
}