n = int(input())
A = [int(input()) for _ in range(n + 1)]
B = [int(input()) for _ in range(n + 1)]
mod = 10**9 + 7

accumB = [B[0]]
for i in range(1, n + 1):
    accumB.append((accumB[-1] + B[i]) % mod)
ans = 0
for i in range(n + 1):
    ans += A[i] * accumB[n - i] % mod
    ans %= mod
print(ans)