#include <bits/stdc++.h>
#include <iomanip>

using namespace std;

int main() {
    int N; cin >> N;
    double P; cin >> P;

    double ans = 0;
    vector<int> div(N+1);
    for (int i=2;i<=N;i++) {
        for (int j=i;j<=N;j+=i) div[j]++;
        double E = 1.0;
        for (int e=0;e<div[i]-1;e++) E *= (1.0 - P);
        ans += E;
    }
    cout << fixed << setprecision(16) << ans << endl;
}