#include <cstdio>
#include <vector>
#include <cmath>
#define repeat_from(i,m,n) for (int i = (m); (i) < (n); ++(i))
using namespace std;
int main() {
    int n; double p; scanf("%d%lf", &n, &p);
    double ans = 0;
    vector<int> factor(n+1, 0);
    repeat_from (i,2,n+1) {
        ans += pow(1 - p, factor[i]);
        for (int j = 2*i; j < n+1; j += i) {
            factor[j] += 1;
        }
    }
    printf("%.8lf\n", ans);
    return 0;
}