import math
import sys
def S(): return sys.stdin.readline().rstrip()
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int, sys.stdin.readline().rstrip().split())
def LI(): return list(map(int, sys.stdin.readline().rstrip().split()))
def LS(): return list(sys.stdin.readline().rstrip().split())

n = I()
a = []
for i in range(n+1):
    a.append(I())
b = []
for i in range(n+1):
    b.append(I())
ans = 0
sum_b = sum(b)
for i in range(n+1):
    ans += a[i]*sum_b
    sum_b -= b[n-i]

MOD = 10**9+7
ans %= MOD

print(ans)