#include<bits/stdc++.h>
#define EM 1000000
using namespace std;
using LL = long long;
using P = pair<LL, LL>;
LL LINF = 1e18;
int INF = 1e9;
LL mod = 1e9+7;
using vint = vector<int>;
using vLL = vector<LL>;
using vvint = vector<vector<int>>;
using vvLL = vector<vector<LL>>;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

int main(){
    int N;
    double p;
    cin >> N >> p;
    vint a(N+1, 0);
    vector<double>  P(N+1, 1);
    for(int i = 1;i <= N;i++)   P[i] = (1-p) * P[i-1];
    for(int i = 2;i <= N;i++){
        for(int j = i;j <= N;j += i){
            a[j]++;
        }
    }
    double ans = 0;
    for(int i = 2;i <= N;i++){
        if(a[i] == 1)   ans += (double) 1;
        else ans += P[a[i]-1];
    }
    cout << setprecision(20) << ans << endl;
}