N = int(input()) + 1
A = [int(input()) for i in range(N)]
B = [int(input()) for i in range(N)]

ans = 0
MOD = 10**9 + 7
for i in range(N) :
    for j in range(N) :
        if i+j > N-1 :
            continue
        ans += A[i]*B[j]
ans %= MOD
print(ans)