p=[]
e=[ 1.0000000000000000,
    1.0833333333333333,
    1.2569444444444444,
    1.5353009259259260,
    1.6915991512345676,
    2.0513639724794235]

for i in range(1,6):
    p.append(e[i]+sum(p)-1-sum([pi*(ei+1) for pi,ei in zip(p,e[i-1::-1])]))

p.append(1-sum(p))

for i in range(6,1000000+1):
    e.append(1+sum([pi*ei for pi,ei in zip(p,e[:-7:-1])]))

for _ in range(input()):
    print e[input()-1]