#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "debug.hpp"
#else
#define debug(...) 1
#endif

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n;
    cin >> n;
    double p;
    cin >> p;
    vector<int> cnt(n + 1, 1);
    for (int i = 2; i <= n; i++) {
        for (int j = i; j <= n; j += i) {
            cnt[j]++;
        }
    }
    double ans = 0;
    for (int i = 2; i <= n; i++) {
        ans += pow(1 - p, cnt[i] - 2);
    }
    cout << fixed << setprecision(15) << ans << '\n';
}