#include <bits/stdc++.h>
using namespace std;
int Q, N; bool vis[1000009]; double dp[1000009];
double r[] = { 1.0 / 12, 1.0 / 6, 1.0 / 4, 1.0 / 12, 1.0 / 4, 1.0 / 6 };
double rec(int x) {
	if(x <= 0) return 0.0;
	if(vis[x]) return dp[x];
	double ret = 0.0;
	for(int i = 1; i <= 6; i++) ret += rec(x - i) * r[i - 1];
	vis[x] = true;
	return dp[x] = ret + 1;
}
int main() {
	rec(1000);
	cin >> Q;
	while(Q--) {
		cin >> N;
		cout << fixed << setprecision(15) << dp[N] << endl;
	}
	return 0;
}