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

using namespace std;
using ld = long double;

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

    ld ret = 1;
    for (int i = 3; i <= n; i++) {
        ld count = 0;
        for (int j = 2; j * j <= i; j++) {
            if (i % j == 0) {
                count++;
                if (j * j != i)count++;
            }
        }

        ld now = 1;
        while (count--)now *= (1 - p);
        ret += now;
    }

    cout << fixed << setprecision(15) << ret << endl;
    return 0;
}