N=int(input())
f=[]
g=[]
v=0
mod=10**9+7
for i in range(N+1):
  f.append(int(input()))
for i in range(N+1):
  v+=int(input())
  g.append(v)
ans=0
for i in range(N+1):
    ans+=(f[i]*g[-i-1])
print(ans%mod)