#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<long long,long long> pll;
#define pb push_back
#define mp make_pair
#define rep(i,n) for(int i=0;i<(n);++i)
constexpr int mod=1000000007;
constexpr int mod1=998244353;
vector<int> dx={0,1,0,-1},dy={-1,0,1,0};
bool inside(int y,int x,int h,int w){
	if(y<h && y>=0 && x<w && x>=0) return true;
	return false;
}





int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	int n;cin >> n;
	double p;cin >> p;
	double q = 1 - p;
	vector<double> a(n + 1, 1);
	double ans = 0;
	for(int i = 2; i <= n; i++){
		for(int j = i * 2; j <= n; j += i){
			a.at(j) *= q;
		}
	}
	for(int i = 2; i <= n; i++){
		ans += a.at(i);
	}
	cout << setprecision(20) << fixed << ans << endl;
}