#define _USE_MATH_DEFINES
#include <algorithm>
#include <cstdio>
#include <functional>
#include <iostream>
#include <cfloat>
#include <climits>
#include <cstring>
#include <cmath>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <time.h>
#include <vector>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> i_i;
typedef pair<ll, int> ll_i;
typedef pair<double, int> d_i;
typedef pair<ll, ll> ll_ll;
typedef pair<double, double> d_d;
struct edge { int u, v; ll w; };

ll MOD = 1000000007;
ll _MOD = 1000000009;
double EPS = 1e-10;

int main() {
	int T; cin >> T;
	while (T--) {
		int N; cin >> N;
		vector<double> dp(N + 1, 1);
		dp[0] = 0;
		for (int i = 1; i <= N; i++)
			for (int j = 1; j <= 6; j++) {
				int _i = max(0, i - j);
				dp[i] += dp[_i] / 6;
			}
		printf("%.10f\n", dp[N]);
	}
}