#include <vector>
#include <math.h>
#include <iostream>
#include <algorithm>
using namespace std;

#define rep(i, S, E) for(int i=(S); i<=(E); i++)

int main() {
    int N; double p;
    cin >> N >> p;
    
    p = 1 - p;
    vector<double> M;
    M.resize(N+1, 1);
    
    double answer = 0;
    rep(i, 2, N){
        answer += M[i];
        for(int j=2; i*j<=N; j++){
            M[i*j] *= p;
        }
    }
    
    printf("%.10f", answer);
    
    return 0;
}