#include<bits/stdc++.h>
// #include<atcoder/all>
// #include<boost/multiprecision/cpp_int.hpp>

using namespace std;
// using namespace atcoder;
// using bint = boost::multiprecision::cpp_int;
using ll = long long;
using ull = unsigned long long;
using P = pair<int,int>;
#define rep(i,n) for(ll i = 0;i < (ll)n;i++)
#define ALL(x) (x).begin(),(x).end()
#define MOD 1000000007


int main(){
  
  int T;
  cin >> T;
  vector<long double> p(10);
  p[1]=1.0/12;
	p[2]=2.0/12;
	p[3]=3.0/12;
	p[4]=1.0/12;
	p[5]=3.0/12;
	p[6]=2.0/12;
  cout << fixed << setprecision(20);
  while(T--){
    int n;
    cin >> n;
    vector<long double> back(n+1);
    for(int i = n-1;i >= 0;i--){
      for(int j = 1;j <= 6;j++)back[i] += (back[min(i+j,n)]+1)*p[j];
    }
    cout << back[0] << "\n";
  }
  

  return 0;
}