def mul(a, b):
    n = len(a)
    c = [[0] * n for i in range(n)]
    for i in range(n):
        ai = a[i]
        ci = c[i]
        for k in range(n):
            bk = b[k]
            for j in range(n):
                ci[j] += ai[k] * bk[j]
    return c


def pw(a, n):
    if n == 1:
        return a
    y = pw(mul(a, a), n // 2)
    if n % 2 == 0:
        return y
    else:
        return mul(a, y)


def solve():
    ma = [[1 / 6, 1 / 6, 1 / 6, 1 / 6, 1 / 6, 1 / 6],
          [1, 0, 0, 0, 0, 0],
          [0, 1, 0, 0, 0, 0],
          [0, 0, 1, 0, 0, 0],
          [0, 0, 0, 1, 0, 0],
          [0, 0, 0, 0, 1, 0],
          ]

    mb = [[1 / 6, 1 / 6, 1 / 6, 1 / 6, 1 / 6, 1 / 6, 1],
          [1, 0, 0, 0, 0, 0, 0],
          [0, 1, 0, 0, 0, 0, 0],
          [0, 0, 1, 0, 0, 0, 0],
          [0, 0, 0, 1, 0, 0, 0],
          [0, 0, 0, 0, 1, 0, 0],
          [0, 0, 0, 0, 0, 0, 1],
          ]

    T = int(input())
    for i in range(T):
        N = int(input())

        if N <= 6:
            print(6)
        elif N <= 200:
            an = pw(ma, N)
            bn = pw(mb, N)
            a = sum(an[0][1:6])
            b = bn[0][6]
            print(b / (1 - a))
        else:
            print('%d.666666666666666' % (N + 1))


if __name__ == '__main__':
    solve()