#include <bits/stdc++.h>

using namespace std;

typedef pair<int,int> P;
typedef pair<int,pair<int,int>> PP;
typedef long long ll;

const double EPS = 1e-8;
const int INF = 1e9;
const int MOD = 1e9+7;

int dy[] = {0,1,0,-1};
int dx[] = {1,0,-1,0};

int main(void) {
	int n;double p;
	cin >> n >> p;
	vector<double> prob(n+1,1.);

	double ret = 0;
	for(int i=2;i<=n;i++){
		ret += prob[i];
		for(int j=2;i*j<=n;j++){
			prob[i*j] *= 1.-p;
		}
	}
	cout << fixed << setprecision(10) << ret << endl;
	return 0;
}