#include <bits/stdc++.h>

using namespace std;

const int MAX_N = 1000000;

double dp[MAX_N + 1];

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n;
    double p;
    cin >> n >> p;
    p = 1 - p;
    fill(dp + 2, dp + n + 1, 1.0);
    for (int i = 2; i <= n / 2; i++) {
        for (int j = 2; i * j <= n; j++) {
            dp[i * j] *= p;
        }
    }
    double ans = 0.0;
    for (int i = 2; i <= n; i++) ans += dp[i];
    printf("%.10lf\n", ans);
    return 0;
}