n = int(input())
A_ = list(map(int, input().split()))
B_ = list(map(int, input().split()))
A = []
for i in range(n):
    if A_[i]:
        A.append((A_[i], B_[i]))
A.sort(key = lambda x: x[1] / x[0])
ans0 = 0
ans1 = 0
for i in range(len(A)):
    ans1 += A[i][0]
mod = 10**9+7
for i in range(len(A)):
    ans0 += A[i][0]
    ans1 -= A[i][0]
    if ans0 >= ans1:
        a, b = A[i]
        print(b * pow(a, -1, mod) % mod)
        break