#include<iostream>
#include<vector>

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++) {
        double r = 1.0;
        double x = 1.0-P;
        for (int j=0;j<divided[i];j++) r *= x;
        res += r;
        for (int j=i;j<=N;j+=i) {
            divided[j]++;
        }
    }
    cout << res << endl;
}