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
ans = 0

for i in range(n+1) :
    for p in range(i+1) :
        q = i-p
        ans += A[p]*B[q]
        ans %= MOD
print(ans)