#include "bits/stdc++.h"

using namespace std;

using ll = long long;
using ld = double;
using P = pair<int, int>;
constexpr ld EPS = 1e-12;
constexpr int INF = numeric_limits<int>::max() / 2;
constexpr int MOD = 1e9 + 7;

int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);

    int N;
    ld p;
    cin >> N >> p;
    vector<int> divs(N + 1, 0);
    for (int i = 1; i <= N; i++)
    {
        for (int j = i; j <= N; j += i)
        {
            divs[j]++;
        }
    }
    vector<ld> dp(N + 1, 1);
    ld res = 0;
    for (int i = 2; i <= N; i++)
    {
        dp[i] = pow((1.0 - p), divs[i] - 2);
        res += dp[i];
    }
    cout << fixed << setprecision(10) << res << endl;
}