#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)
#define mod 1000000007

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  int n;cin>>n;
  n++;
  ll a[n],b[n],pref[n];
  rep(i,n)cin>>a[i];
  rep(i,n)cin>>b[i];
  rep(i,n){
    pref[i]=b[i];
    if(i)pref[i]=(pref[i]+pref[i-1])%mod;
  }
  ll ans=0;
  rep(i,n){
    ans+=a[i]*pref[n-1-i]%mod;
    ans%=mod;
  }
  cout<<ans<<endl;
}