#include <iostream>
#include <cmath>
#include <iomanip>
#include <vector>

using ldouble = long double;

void solve() {
    int n;
    ldouble pr;
    std::cin >> n >> pr;

    std::vector<int> cnt(n + 1, 0);
    for (int p = 2; p <= n; ++p) {
        for (int q = p * 2; q <= n; q += p) ++cnt[q];
    }

    ldouble ans = 0;
    for (int p = 2; p <= n; ++p) {
        ans += std::pow(1 - pr, cnt[p]);
    }

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

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

    solve();

    return 0;
}