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