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

int main() {
	int N;
	double P;
	cin >> N >> P;
	P = 1 - P;
	vector<int> Count(N + 1, 0);
	vector<double> Pow(N + 1);
	Pow[0] = 1;
	for (int i = 0; i < N; i++) Pow[i + 1] = Pow[i] * P;
	for (int i = 2; i <= N; i++) {
		for (int j = 2; i * j <= N; j++) {
			Count[i * j]++;
		}
	}
	double ANS = 0;
	for (int i = 2; i <= N; i++) {
		ANS += Pow[Count[i]];
	}
	printf("%.12lf\n", ANS);
}