from functools import cmp_to_key

def compare_frac(p1, p2):
    b1, a1 = p1
    b2, a2 = p2
    v1 = b1 * a2
    v2 = b2 * a1
    if v1 < v2: return -1
    if v1 > v2: return 1
    return 0

N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))

mod = 10**9 + 7
    
C = []
total_weight = 0
    
for i in range(N):
    if A[i] == 0:
        continue
        
    ai, bi = A[i], B[i]
    if ai < 0:
        ai, bi = -ai, -bi
        
    C.append((bi, ai))
    total_weight += ai

C.sort(key=cmp_to_key(compare_frac))

current_weight = 0
ans_b, ans_a = 0, 1
    
for b, a in C:
    current_weight += a
    if current_weight * 2 >= total_weight:
        ans_b, ans_a = b, a
        break
    
print((ans_b * pow(ans_a, -1, mod)) % mod)