from itertools import permutations
N = int(input())
A = list(map(int,input().split()))
B = list(map(int,input().split()))
A.sort(reverse = True)
B.sort()
maxv = 0
for i in range(N):
    maxv += max(0,A[i]-B[i])
ans = 0
for X in permutations(range(N),N):
    tmp = 0
    for i in range(N):
        tmp += max(0, A[X[i]] - B[i])
    if maxv == tmp:
        ans += 1
print(ans)