#include <bits/stdc++.h>

#include <atcoder/all>

using namespace std;

int main() {
    int N;
    double p;
    cin >> N >> p;
    vector<double> dp(N + 1, 1);
    double ans = 0;
    for (int x = 2; x <= N; x++) {
        ans += dp[x];
        for (int i = 2; x * i <= N; i++) {
            dp[x * i] *= 1 - p;
        }
        cerr << dp[x] << ' ';
    }
    cerr << endl;
    cout << fixed << setprecision(10) << ans << endl;
}