#include <bits/stdc++.h>
using namespace std;
using ld = long double;

ld p[] = { 1.0 / 12, 1.0 / 6, 1.0 / 4, 1.0 / 12, 1.0 / 4, 1.0 / 6 };

int main()
{
	cout << fixed << setprecision(6);
	int T;
	cin >> T;
	while (T--) {
		int N;
		cin >> N;
		vector<ld> dp(N);
		for (int i = N - 1; i >= 0; i--) {
			for (int j = 1; j <= 6; j++) {
				dp[i] += ((i + j >= N ? 0 : dp[i + j]) + 1) * p[j - 1];
			}
		}
		cout << dp[0] << endl;
	}
	return 0;
}