#include <bits/stdc++.h>
using namespace std;

using ld = long double;

int n;

// e0を仮定してにぶたん
bool le(const ld e0){
    vector<ld> e(n+1);
    for(int i = n-1; i >= 0; i--){
        for(int j = i+1; j <= i+6; j++){
            if(j > n){
                e[i] += (e0+1) / 6;
            } else {
                e[i] += (e[j]+1) / 6;
            }
        }
    }
    return e0 < e[0];
}

ld solve(){
    if(n > 700) return n + 5./3;
    ld lo = 0;
    ld hi = 1e9;
    for(int _ = 0; _ < 60; ++_){
        ld mid = (lo + hi) / 2;
        if(le(mid)) lo = mid;
        else hi = mid;
    }
    return lo;
}

int main(){
    int t;
    cin >> t;
    while(t--){
        cin >> n;
        printf("%.20lf\n", (double)solve());
    }
}