#include <iostream>
#include <iomanip>
#include <vector>
using ld = long double;
int main()
{
    int N;
    ld P;
    std::cin >> N >> P;
    std::vector<ld> p(N + 1, 1);
    for (int i = 1; i <= N; i++) { p[i] = (1 - P) * p[i - 1]; }
    std::vector<int> cnt(N + 1, 0);
    for (int i = 2; i <= N; i++) {
        for (int j = 2; i * j <= N; j++) { cnt[i * j]++; }
    }
    ld ans = 0;
    for (int i = 2; i <= N; i++) { ans += p[cnt[i]]; }
    std::cout << std::fixed << std::setprecision(15) << ans << std::endl;
    return 0;
}