import itertools
def game(inlist1,inlist2):
    s = 0
    for i in range(len(inlist1)):
        if inlist1[i] > inlist2[i]:
            s += 1
        elif inlist1[i] < inlist2[i]:
            s -= 1
    if s > 0:
        ans = "WIN"
    elif s == 0:
        ans = "DRAW"
    else:
        ans = "LOSE"
    return ans


n = int(input())

alist = [ int(v) for v in input().split() ]
blist = [ int(v) for v in input().split() ]

b_permutation_list = list(itertools.permutations(blist))
game_list = []

for i in b_permutation_list:
    game_list.append(game(alist,i))

print(game_list.count("WIN")/len(game_list))