from itertools import permutations
N = int(input())
A = list(map(int,input().split()))
B = list(map(int,input().split()))
A.sort()
B.sort(reverse=True)
point = 0
for i in range(N):
    if A[i] > B[i]:
        point += (A[i]-B[i])
ans = 0
for pattern in permutations(A,r=N):
    count = 0
    pattern = list(pattern)
    for i in range(N):
        if pattern[i] > B[i]:
            count += (pattern[i]-B[i])
    if point == count:
        ans += 1
print(ans)