#include "bits/stdc++.h"

using namespace std;

using ll = long long;
using ld = long 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<ld> dp(N + 1, 1);
    ld res = 0;
    for (int i = 2; i <= N; i++)
    {
        for (int j = 2; j * j <= i; j++)
        {
            if (i % j == 0)
            {
                dp[i] *= (1.0 - p) * (1.0 - p);
            }
        }
        res += dp[i];
    }
    cout << fixed << setprecision(10) << res << endl;
}