import sys
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
INF = 2 ** 63 - 1
mod = 998244353
mod = 10 ** 9 + 7
n = ii()

a = li()
b = li()

AB = [(a[i], b[i]) for i in range(n)]

AB.sort(key = lambda x: (x[1] - 1) / x[0], reverse=True)
ans = 0
foo = 1
for a, b in AB:
    ans += foo * a
    ans %= mod
    foo *= b
    foo %= mod
print(ans)