#pragma GCC optimize("Ofast")
#include <cstdio>
#include <cstdlib>
#include <string>
#include <algorithm>
#include <iostream>
#include <queue>
#include <vector>
#include <bitset>
#include <cmath>
#include <limits>
#include <iostream>
#include <map>
#include <set>
#include <tuple>
#include <iomanip>
#include <functional>

using namespace std;

typedef long long ll;
typedef pair<int,int> pii;
typedef pair<int,ll> pil;
typedef pair<ll,int> pli;
typedef pair<ll,ll> pll;

template<class T,class U>constexpr bool chmin(T&a,const U b){if(a<=b)return false;a=b;return true;}
template<class T,class U>constexpr bool chmax(T&a,const U b){if(a>=b)return false;a=b;return true;}
#define bit(n,k) ( (n>>k)&1 )

//デバッグ
template<class T>
void Vout(vector<T> &V){
    cout<<"\nstart\n";
    const int sz=V.size();
    for(int i=0;i<sz;i++){
        cout<<i<<" "<<V[i]<<'\n';
    }
    cout<<"end\n"<<endl;
}

template<class T>
void VPout(vector<T> &V){
    cout<<"\nstart\n";
    const int sz=V.size();
    for(int i=0;i<sz;i++){
        cout<<i<<" "<<V[i].first<<" "<<V[i].second<<'\n';
    }
    cout<<"end\n"<<endl;
}


//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


constexpr int MAX=1<<30;
constexpr ll INF=1LL<<62;
constexpr int MOD=1e9+7;
int dx[]={1,-1,0,0},dy[]={0,0,-1,1};

//__builtin_popcount(S);
//#define int ll
//vector<vector<int>> data(3, vector<int>(4));
//vector.resize(a,vector<int>(b,-1));
//vector<vector<vector<要素の型>>> 変数名(要素数1, vector<vector<要素の型>>(要素数2, vector<要素の型>(要素数3, 初期値)));




signed main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr); 
    cout<<fixed<<setprecision(10);
    
    int N;
    double p;
    cin>>N>>p;
    double ret=0;
    vector<double> ans(N+1,1);
    for(int i=2;i<=N;i++){
        ret+=ans[i];
        for(int j=i*2;j<=N;j+=i){
            ans[j]*=(1-p);
        }
    }
    cout<<ret<<endl;
}