#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<ll, ll>;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
int main()
{
    int n;
    double p;
    cin >> n >> p;
    double ans = 0;
    vector<int> cnt(n+1, 0);
    for(int i = 2; i <= n; i++)
    {
        for(int j = i; j <= n; j+=i) cnt[j]++;
    }
    for(int i = 2; i <= n; i++) ans += pow((1-p), cnt[i]-1);
    cout << fixed << setprecision(10) << ans << endl;
}