#int(input())
#map(int, input().split())
#list(map(int, input().split()))

N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
mod = 10 ** 9 + 7

c = [0] * N
for i in range(N):
    if B[i] == 1:
        u = 10 ** 10
    else:
        u = A[i] / (B[i]-1)
    c[i] = [A[i], B[i], u]

c = sorted(c, key=lambda x:(x[2]))

ans = 0
x = 1
# u = [1, 0, 5, 7, 3, 4, 2, 6]
for i in range(N):
# for i in u:
    # print(c[i])
    ans += x * c[i][0]
    ans %= mod
    x = (x * c[i][1]) % mod

print(ans)