// URL: https://yukicoder.me/problems/no/301

import std.algorithm, std.array, std.container, std.math, std.range, std.typecons, std.string;

version(unittest) {} else
void main()
{
  int T; io.getV(T);

  auto m = Matrix!double(7, 7);
  foreach (i; 0..6) m[0][i] = 1.0/6;
  foreach (i; 0..5) m[i+1][i] = 1;
  m[0][6] = m[6][6] = 1;

  foreach (_; 0..T) {
    long N; io.getV(N);
    auto r = m^^N;
    io.put!`{floatFormat: "%.13f"}`(r[0][6]/(1-r[0][1..6].sum));
  }
}

auto lowerBoundBy(alias conv = "a", alias comp = "a<b", R, T)(R a, T v)
{ return a.sortedTuple!(conv, comp).lowerBound(tuple(a.front, v)).map!"a[0]"; }

auto upperBoundBy(alias conv = "a", alias comp = "a<b", R, T)(R a, T v)
{ return a.sortedTuple!(conv, comp).upperBound(tuple(a.front, v)).map!"a[0]"; }

auto sortedTuple(alias conv = "a", alias comp = "a<b", R)(R a)
{
  import std.functional;
  alias convFun = unaryFun!conv, compFun = binaryFun!comp;
  return a.map!(e => tuple(e, convFun(e))).assumeSorted!((a, b) => compFun(a[1], b[1]));
}

pure T isqrt(T)(T n)
{
  static if (is(T == int)) auto max = 46341;
  else static if (is(T == long)) auto max = 3037000500L;
  return iota(T(0), max).lowerBoundBy!("a^^2", "a<=b")(n).back;
}

pure T icbrt(T)(T n)
{
  static if (is(T == int)) auto max = 1291;
  else static if (is(T == long)) auto max = 2097152L;
  return iota(T(0), max).lowerBoundBy!("a^^3", "a<=b")(n).back;
}

pure T powr(alias pred = "a*b", T, U)(T a, U n, T one)
{
  import std.functional;
  alias predFun = binaryFun!pred;
  if (n == 0) return one;
  auto r = one;
  for (; n > 0; n >>= 1) { if (n&1) r = predFun(r, a); a = predFun(a, a); }
  return r;
}
pure T powr(alias pred = "a*b", T, U)(T a, U n) { return powr!(pred, T, U)(a, n, T(1)); }

pure T extGcd(T)(T a, T b, out T x, out T y)
{
  auto g = a; x = 1; y = 0;
  if (b) { g = extGcd(b, a%b, y, x); y -= a/b*x; }
  return g;
}

struct Vector(T, T zero = T(0))
{
  alias V = Vector!(T, zero), Op = string;
  size_t n;
  @property T[] array() { return a; }
  alias array this;

  this(size_t n) in { assert(n > 0); } do
  {
    this.n = n;
    a = new T[](n);
    static if (T.init != zero) a[] = zero;
  }
  this(U)(U[] b) in { assert(b.length > 0); } do
  {
    n = b.length;
    static if (is(T == U)) a = b;
    else { a = new T[](n); foreach (i; 0..n) a[i] = b[i]; }
  }

  pure V dup() { auto b = V(n); b[] = a[]; return b; }

  pure V opBinary(Op op)(V b) if (op=="+"||op=="-") in { assert(n == b.n); } do
  {
    auto x = V(n);
    foreach (i; 0..n) x[i] = mixin("a[i]"~op~"b[i]");
    return x;
  }
  ref V opOpAssign(Op op)(V b) if (op=="+"||op=="-") in { assert(n == b.n); } do
  {
    foreach (i; 0..n) mixin("a[i]"~op~"=b[i];");
    return this;
  }

  pure V opBinary(Op op: "*")(T b)
  {
    auto x = V(n);
    foreach (i; 0..n) x[i] = a[i]*b;
    return x;
  }
  ref V opOpAssign(Op op: "*")(T b)
  {
    foreach (i; 0..n) a[i] *= b;
    return this;
  }

  pure T opBinary(Op op: "*")(V b) in { assert(n == b.n); } do
  {
    auto x = zero;
    foreach (i; 0..n) x += a[i]*b[i];
    return x;
  }

  private T[] a;
}
Vector!(T, zero) vector(T, T zero = T(0))(T[] a)
{ return Vector!(T, zero)(a); }
Vector!(T, zero) vector(T, U, T zero = T(0))(U[] a) if (!is(T == U))
{ return Vector!(T, zero)(a); }

pure T hypot2(T, alias zero)(Vector!(T, zero) a) { return a*a; }

pure Vector!(T, zero) cross(T, alias zero)(Vector!(T, zero) a, Vector!(T, zero) b)
in { assert(a.n == 3 && b.n == 3); } do
{ return Vector!(T, zero)([a[1]*b[2]-a[2]*b[1], a[2]*b[0]-a[0]*b[2], a[0]*b[1]-a[1]*b[0]]); }

struct Matrix(T, T zero = T(0), T one = T(1))
{
  alias M = Matrix!(T, zero, one), V = Vector!(T, zero), Op = string;
  size_t r, c;
  @property T[][] array() { return a; }
  alias array this;

  static auto unit(size_t n) in { assert(n > 0); } do
  {
    auto r = M(n, n);
    foreach (i; 0..n) r[i][i] = one;
    return r;
  }

  this(size_t r, size_t c) in { assert(r > 0 && c > 0); } do
  {
    this.r = r; this.c = c;
    a = new T[][](r, c);
    static if (T.init != zero) foreach (i; 0..r) a[i][] = zero;
  }
  this(U)(U[][] b)
  in { assert(b.length > 0 && b[0].length > 0 && b.all!(l => l.length == b[0].length)); } do
  {
    r = b.length; c = b[0].length;
    static if (is(T == U)) a = b;
    else { a = new T[][](r, c); foreach (i; 0..r) foreach (j; 0..c) a[i][j] = b[i][j]; }
  }

  pure M dup() { auto b = M(r, c); foreach (i; 0..r) b[i][] = a[i][]; return b; }

  pure bool opEquals(M b)
  {
    return r == b.r && c == b.c && zip(a, b.a).all!"a[0]==a[1]";
  }

  pure M opBinary(Op op)(M b) if (op=="+"||op=="-") in { assert(r == b.r && c == b.c); } do
  {
    auto x = M(r, c);
    foreach (i; 0..r) foreach (j; 0..c) x[i][j] = mixin("a[i][j]"~op~"b[i][j]");
    return x;
  }
  ref M opOpAssign(Op op)(M b) if (op=="+"||op=="-") in { assert(r == b.r && c == b.c); } do
  {
    foreach (i; 0..r) foreach (j; 0..c) mixin("a[i][j]"~op~"=b[i][j];");
    return this;
  }

  pure M opBinary(Op op: "*")(T b)
  {
    auto x = M(r, c);
    foreach (i; 0..r) foreach (j; 0..c) x[i][j] = a[i][j]*b;
    return x;
  }
  ref M opOpAssign(Op op: "*")(T b)
  {
    foreach (i; 0..r) foreach (j; 0..c) a[i][j] *= b;
    return this;
  }

  pure M opBinary(Op op: "*")(M b) in { assert(c == b.r); } do
  {
    auto x = M(r, b.c);
    foreach (i; 0..r) foreach (j; 0..b.c) foreach (k; 0..c) x[i][j] += a[i][k]*b[k][j];
    return x;
  }
  ref M opOpAssign(Op op: "*")(M b) in { assert(c == b.r); } do
  {
    auto x = this*b;
    r = x.r; c = x.c; a = x.a;
    return this;
  }

  pure V opBinary(Op op: "*")(V b) in { assert(c == b.n); } do
  {
    auto x = V(r);
    foreach (i; 0..r) foreach (j; 0..c) x[i] += a[i][j]*b[j];
    return x;
  }

  pure M opBinary(Op op: "^^", U)(U n) in { assert(r == c); } do
  {
    return powr(this, n, M.unit(r));
  }

  private T[][] a;
}
Matrix!(T, zero, one) matrix(T, T zero = T(0), T one = T(1))(T[][] a)
{ return Matrix!(T, zero, one)(a); }
Matrix!(T, zero, one) matrix(T, U, T zero = 0, T one = 1)(U[][] a) if (!is(T == U))
{ return Matrix!(T, zero, one)(a); }

pure T det(T, alias zero, alias one)(Matrix!(T, zero, one) a) in { assert(a.r == a.c); } do
{
  auto n = a.r, b = a.dup, d = one;

  foreach (i; 0..n) {
    auto p = i;
    foreach (j; i+1..n)
      if (b[p][i].abs < b[j][i].abs) p = j;
    swap(b[p], b[i]);
    foreach (j; i+1..n)
      foreach (k; i+1..n)
        b[j][k] -= b[i][k]*b[j][i]/b[i][i];
    d *= b[i][i];
    if (p != i) d = -d;
  }

  return d;
}

auto io = IO!()();
import std.stdio;
struct IO(alias IN = stdin, alias OUT = stdout)
{
  import std.conv, std.format, std.meta, std.traits, core.stdc.stdlib;

  auto getV(T...)(ref T v) { foreach (ref w; v) get(w); }
  auto getA(T)(size_t n, ref T v) if (hasAssignableElements!T)
  { v = new T(n); foreach (ref w; v) get(w); }
  auto getC(T...)(size_t n, ref T v)
  if (allSatisfy!(hasAssignableElements, T))
  {
    foreach (ref w; v) w = new typeof(w)(n);
    foreach (i; 0..n) foreach (ref w; v) get(w[i]);
  }
  auto getM(T)(size_t r, size_t c, ref T v)
  if (hasAssignableElements!T && hasAssignableElements!(ElementType!T))
  { v = new T(r); foreach (ref w; v) getA(c, w); }
  template getS(E...)
  {
    auto getS(T)(size_t n, ref T v)
    { v = new T(n); foreach (ref w; v) foreach (e; E) mixin("get(w."~e~");"); }
  }

  const struct PutConf
  {
    bool newline = true, flush, exit;
    string floatFormat = "%.10f", delimiter = " ";
  }

  auto put(alias conf = "{}", T...)(T v)
  { mixin("const PutConf c = "~conf~"; putMain!c(v);"); }
  auto putB(alias conf = "{}", S, T)(bool c, S t, T f)
  { if (c) put!conf(t); else put!conf(f); }
  auto putRaw(T...)(T v) { OUT.write(v); OUT.writeln; }

  private
  {
    dchar[] buf;
    auto sp = (new dchar[](0)).splitter;
    void nextLine() { IN.readln(buf); sp = buf.splitter; }
    auto get(T)(ref T v) { if (sp.empty) nextLine(); v = sp.front.to!T; sp.popFront(); }

    auto putMain(PutConf c, T...)(T v)
    {
      foreach (i, w; v) {
        putOne!c(w);
        if (i < v.length-1) OUT.write(c.delimiter);
      }
      static if (c.newline) OUT.writeln;
      static if (c.flush) OUT.flush();
      static if (c.exit) exit(0);
    }
    auto putOne(PutConf c, T)(T v)
    {
      static if (isInputRange!T && !isSomeString!T) putRange!c(v);
      else if (isFloatingPoint!T) OUT.write(format(c.floatFormat, v));
      else OUT.write(v);
    }
    auto putRange(PutConf c, T)(T v)
    {
      auto w = v;
      while (!w.empty) {
        putOne!c(w.front); w.popFront();
        if (!w.empty) OUT.write(c.delimiter);
      }
    }
  }
}