from itertools import permutations
N = int(input())
A = [int(a) for a in input().split()]
B = [int(a) for a in input().split()]
ans = 0
for a in permutations([i for i in range(N)]):
    s = 0
    l = 1
    for i in a:
        s += l * A[i]
        l *= B[i]
    ans = max(ans, s)
print(ans % (10 ** 9 + 7))