#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <complex>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <iomanip>
#include <assert.h>
#include <array>
#include <cstdio>
#include <cstring>
#include <random>
#include <functional>
#include <numeric>

using namespace std;

#define REP(i,a,b) for(int i=a;i<(int)b;i++)
#define rep(i,n) REP(i,0,n)
#define all(c) (c).begin(), (c).end()
#define zero(a) memset(a, 0, sizeof a)
#define minus(a) memset(a, -1, sizeof a)
#define minimize(a, x) a = std::min(a, x)
#define maximize(a, x) a = std::max(a, x)

using ll  = long long;
int const inf = 1<<29;

int N;
double dp[1001];

double memo[1001];

double check(double x) {

  if(memo[N] >= 0) return memo[N];

  REP(i, 1, N+1) {
    dp[i] = 0;
    REP(j, 1, 7) {
      if(i < j) {
        dp[i] += x;
      }
      else {
        dp[i] += dp[i-j];
      }
    }
    dp[i] = 1 + dp[i] / 6.0;
  }
  return memo[N] = dp[N];
}

int main() {

  minus(memo);
  int T; cin >> T;
  while(T--) {
    cin >> N;
    N = min(N, 1000);
    zero(dp);
    double l = 0, r = 100000;
    rep(i, 30) {
      double m = (l + r) / 2.0;
      if(m <= check(m)) {
        l = m;
      }
      else {
        r = m;
      }
    }

    printf("%.10f\n", l);
  }
  return 0;
}