n = int(input())
a = list(map(int,input().split()))
b = list(map(int,input().split()))
a.sort(reverse=True)
b.sort()
ans = 1
for i in range(n):
    if a[i] < b[i]:
        for k in range(1,i):
            ans *= k
        for k in range(1,n-k+1):
            ans *= k
        print(ans)
        exit()