#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
using namespace std;

int main()
{
    const int n = 10000;
    vector<pair<double, double> > dp(n+1);
    for(int i=1; i<=n; ++i){
        for(int j=i-6; j<=i-1; ++j){
            if(j < 0){
                dp[i].first += 1.0 / 6.0;
                dp[i].second += 1.0 / 6.0;
            }
            else{
                dp[i].first += (dp[j].first + 1.0) / 6.0;
                dp[i].second += dp[j].second / 6.0;
            }
        }
    }

    int t;
    cin >> t;

    while(--t >= 0){
        long long k;
        cin >> k;

        double ans;
        if(k > n)
            ans = k + 5.0 / 3.0;
        else
            ans = dp[k].first / (1 - dp[k].second);
        printf("%.12f\n", ans);
    }

    return 0;
}