t=int(input())
from copy import deepcopy
a=[[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]]

b=[[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]]

def mat(x,y):
    n=len(x)
    new=[[0]*n for i in range(n)]
    for i in range(n):
        for j in range(n):
            for k in range(n):
                new[i][j]+=x[i][k]*y[k][j]
    return new

def mul (x,n):
    if n==1:return x
    res=deepcopy(mul(x,n//2))
    res=deepcopy(mat(res,res))
    if n%2==0:
        return res
    return mat(res,x)

for _ in range(t):
    n=int(input())
    an=mul(a,n)
    A=an[0][5]+an[0][1]+an[0][2]+an[0][3]+an[0][4]
    bn=mul(b,n)
    B=bn[0][6]

    print(B/(1-A))