n = int(input())
a = list(map(int,input().split()))
b = list(map(int,input().split()))
def compare(ab1,ab2):
    a1,b1 = ab1
    a2,b2 = ab2
    if a1 + b1 * a2 >= a2 + a1 * b2:return -1
    else:return 1
ab = [tmp for tmp in zip(*[a,b])]
from functools import cmp_to_key
ab.sort(key=cmp_to_key(compare))
ans = 0
lb = 1
mod = 10 ** 9 + 7
for aa,bb in ab:
    ans += lb * aa
    lb *= bb
    ans %= mod
    lb %= mod
print(ans)