#include <bits/stdc++.h>
using namespace std;

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

    int div[1000010] = {};

    for (int i = 1; i <= N; i++) {
        for (int j = i; j <= N; j += i) {
            div[j]++;
        }
    }

    double ans = 0;
    for (int i = 2; i <= N; i++) {
        ans += pow(1 - p, div[i] - 2);
    }

    cout << fixed << setprecision(10) << ans << endl;
}