#include <iostream>
#include <algorithm>
#include <iomanip>
using namespace std;

const int MAX = 1000000;
const int FACTORS_MAX = 240;
int N;
double P;
unsigned char DP[MAX + 1];
int C[FACTORS_MAX];

void Calc() {
	for (int p = 2; p <= MAX; ++p) {
		for (int i = p * 2; i <= MAX; i += p) {
			++DP[i];
		}
	}
}

int main() {
	cin >> N >> P;
	Calc();

	for (int i = 2; i <= N; ++i) {
		++C[DP[i]];
	}

	double sum = 0;
	double prob = 1;
	for (int k = 0; k < FACTORS_MAX; ++k) {
		sum += prob * C[k];
		prob *= 1 - P;
	}
	cout << fixed << setprecision(16) << sum << endl;
}