n = int(input())
A = [int(input()) for i in range(n + 1)]
B = [int(input()) for i in range(n + 1)]
MOD = 10 ** 9 + 7
Sb = sum(B) % MOD
ans = 0
for i in range(n + 1):
    ans = (ans + A[i] * Sb) % MOD
    Sb = (Sb - B[n - i]) % MOD
print(ans)