MOD = 10 ** 9 + 7

n = int(input())
n += 1
alst = [int(input()) for _ in range(n)]
blst = [int(input()) for _ in range(n)]
cum = [0]
for b in blst:
    cum.append(cum[-1] + b)
ans = 0
for i, a in enumerate(alst):
    ans += cum[n - i] * a
    ans %= MOD
print(ans)