mod = int(1e9) + 7
n = int(input())
a = list(int(input()) for _ in range(n + 1))
b = list(int(input()) for _ in range(n + 1))
for i in range(1, n + 1):
    b[i] += b[i - 1]
ans = 0
for i in range(n + 1):
    ans += a[i] * b[n - i]
print(ans % mod)