n = int(input())
a = [int(input()) for _ in range(n+1)]
b = [int(input()) for _ in range(n+1)]
MOD = 10**9 + 7
ans = 0
b_acc = [0]

for b_i in b:
    b_acc.append(b_acc[-1]+b_i)

for i in range(n+1):
    ans += a[i] * (b_acc[n-i+1]-b_acc[0])
    ans %= MOD

print(ans)