import itertools

N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))

A = sorted(A, reverse=True)
B = sorted(B)

M = sum([max(0, a - b) for a, b in zip(A, B)])

res = 0
for lis in itertools.permutations(A):
    if sum([max(0, a - b) for a, b in zip(lis, B)]) == M:
        res += 1

print(res)