/*
    Author:zeke
    
    pass System Test!
    GET AC!!
*/
#include <iostream>
#include <queue>
#include <vector>
#include <iostream>
#include <vector>
#include <string>
#include <cassert>
#include <algorithm>
#include <functional>
#include <cmath>
#include <queue>
#include <set>
#include <stack>
#include <deque>
#include <map>
#include <iomanip>
#include <utility>
#include <stack>
using ll = long long;
using ld = long double;
using namespace std;
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define all(x) (x).begin(),(x).end()
#define rep3(var, min, max) for (ll (var) = (min); (var) < (max); ++(var))
#define repi3(var, min, max) for (ll (var) = (max) - 1; (var) + 1 > (min); --(var))
#define Mp(a,b) make_pair((a),(b))
#define F first
#define S second
#define Icin(s) ll (s);cin>>(s);
#define Scin(s) ll (s);cin>>(s);
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
typedef pair<ll, ll> P;
typedef vector<ll> V;
typedef vector<V> VV;
typedef vector<P> VP;
ll MOD = 1e9 + 7;
ll INF =1e18;
int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    ld n,p;
    cin>>n>>p;
    ld res=0;
    V vec(1e7);
    rep3(i,2,n+1){
        for(ll j=i*2;j<=n;j+=i){
            vec[j]++;
        }
    }
    rep3(i,2,n+1){
       // cout<<pow((i-p),vec[i])<<endl;
        res+=pow((1-p),vec[i]);
    }
    cout<<setprecision(20)<<res<<endl;
}