#include <iostream>
#include <unordered_map>
#include <cmath>

using namespace std;

int main()
{
    double N, p;
    cin >> N >> p;
    int N_int = (int)N;
    double ans = 0;

    unordered_map<int, int> memo;
    for (int i = 2; i <= N_int; i++)
    {
        for (int j = i; j <= N_int; j += i)
        {
            memo[j] += 1;
        }
        ans += pow(1 - p, memo[i]-1);
    }

    cout << ans << endl;

    return 0;
}