MOD = 10**9+7
N = int(input())
A = list(map(int,input().split()))
B = list(map(int,input().split()))
C = []
for i in range(N):
    if A[i]>0:
        C.append((A[i],B[i],B[i]/A[i]))
    elif A[i]<0:
        C.append((-A[i],-B[i],B[i]/A[i]))
C = sorted(C,key=lambda x:x[2])
M = len(C)
K = 0
for i in range(M):
    K += C[i][0]
if K%2==0:
    cnt = 0
    for i in range(M):
        cnt += C[i][0]
        if cnt>=K//2:
            a,b = C[i][0],C[i][1]
            print((b*pow(a,MOD-2,MOD))%MOD)
            break
else:
    cnt = 0
    for i in range(M):
        cnt += C[i][0]
        if cnt>=K//2+1:
            a,b = C[i][0],C[i][1]
            print((b*pow(a,MOD-2,MOD))%MOD)
            break