import itertools
n = int(input())
salary = list(map(int,input().split()))
jobP = list(map(int,input().split()))
MOD = 10**9+7

ans = -1
for Perm in list(itertools.permutations(list(range(n)))):
	#print(Perm)
	now_ans = 0
	jobPower = 1
	for i in range(n):
		now_ans += salary[Perm[i]]*jobPower
		jobPower *= jobP[Perm[i]]
	#print(now_ans)
	ans = max(ans,now_ans)
print(ans%MOD)