Untitled

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int MAX = 1e6 + 5;
long double a[MAX];
int main()
{
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    long double s = 0, ms = 0;
    for (int i = 1; i <= MAX; i++)
    {
        ms += i;
        s += 1.0 / ms;
        a[i] = s;
    }
    int t;
    cin >> t;
    while (t--)
    {
        int n;
        cin >> n;
        cout << fixed << setprecision(8) << a[n] << endl;
    }
}