//#include <atcoder/all>
#include <bits/stdc++.h>
#include <cmath>
using namespace std;
//using namespace atcoder;
using ll = long long;
#define all(A) A.begin(),A.end()
using vll = vector<ll>;
#define rep(i, n) for (long long i = 0; i < (long long)(n); i++)
using Graph = vector<vector<ll>>;
Graph G;
vll E;
vector<bool> seen;

int main() {
	ll N;
	double p;
	cin>>N>>p;
	vector<ll> D(N+5,0);
	for(ll i=2;i<N;i++){
		for(ll j=i*2;j<=N;j+=i){
			D[j]++;
		}
	}
	double an=0;
	vector<double> pp(10001,1);
	rep(i,10000){
		pp[i+1]=pp[i]*(1-p);
	}
	for(ll i=2;i<=N;i++){
		an+=pp[D[i]];
	}
	cout<<setprecision(16)<<an<<endl;
}