#include<iostream>
#include<vector>
#include<cmath>

using namespace std;

int main() {
    int N; cin >> N;
    double P; cin >> P;

    double res = 0.0;
    vector<int> divided(N+1);
    for (int i=2;i<=N;i++) {
        res += pow(1.0-P, divided[i]);
        for (int j=i;j<=N;j+=i) {
            divided[j]++;
        }
    }
    cout << res << endl;
}