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

int main()
{
    cout << fixed << setprecision(20);
    int N;
    double p;
    cin >> N >> p;
    vector<double> pow2(10001, 1.0);
    for (size_t i = 1; i < pow2.size(); i++) pow2[i] = pow2[i - 1] * (1.0 - p);

    double ret = 0.0;
    vector<int> cnt(N + 1);
    for (int i = 2; i <= N; i++)
    {
        ret += pow2[cnt[i]];
        for (int j = i; j <= N; j += i) cnt[j]++;
    }
    cout << ret << '\n';
}