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

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

    auto div = [](int n) {
        int ret;
        for (int i = 1; i * i <= n; i++) {
            if (n % i == 0) {
                ret++;
                if (i * i != n)
                    ret++;
            }
        }
        return ret;
    };

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

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