import sys
read=sys.stdin.buffer.read
readline=sys.stdin.buffer.readline
readlines=sys.stdin.buffer.readlines

mx=500
dp=[0]*mx
dp[0]=1.0
dpe=[0]*mx
for i in range(1, mx):
    dpe[i]=1.0
    for j in range(1, 7):
        if i-j>=0:
            dp[i]+=dp[i-j]/6.0
            dpe[i]+=dpe[i-j]/6.0
t=int(readline())
for _ in range(t):
    n=int(readline())
    if n<mx:
        print('{:.13f}'.format(dpe[n]/dp[n]))
    else:
        print('{:.13f}'.format(n+5/3))