n = int(input())
mod = 10**9+7
alist = [ int(input()) for i in range(n+1) ]
for i in range(1,n+1):
    alist[i] = ( alist[i-1] + alist[i] ) % mod


for i in range(n+1):
    alist[n-i] = (int(input()) * alist[n-i]) % mod

print(sum(alist) % mod)