#include <iostream>
#include <vector>
#include <algorithm>
#include <iomanip>

using namespace std;
using ld = long double;

int main() {
    int n;
    ld p;
    cin >> n >> p;

    vector<int> count(n + 1);
    for (int i = 2; i <= n; i++) {
        for (int j = i * 2; j <= n; j += i)count[j]++;
    }

    vector<ld> v(1000, 1.0);
    for (int i = 1; i < 1000; i++)v[i] = v[i - 1] * (1.0 - p);

    ld ret = 0;
    for (int i = 2; i <= n; i++) {
        ret += v[count[i]];
    }

    cout << fixed << setprecision(20) << ret << endl;
    return 0;
}