#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
typedef long long ll;
#define int long long
static const int mod=1000000007;

signed main(){
  int n;
  cin>>n;
  int a[n+2];
  int b[n+1];
  int sum=0;
  rep(i,n+1){
    cin>>a[i];
    sum+=a[i];
    sum%=mod;
  }
  a[n+1]=0;
  rep(i,n+1) cin>>b[i];  
  int ans=0;
  rep(i,n+1){   
    ans+=((b[i]*sum)%mod);
    ans%=mod;
    //cout<<b[i]*sum<<" "<<ans<<endl;
    sum-=a[n-i];
    if(sum<0) sum+=mod;
  }
  if(ans<0) ans+=mod;
  cout<<ans<<endl;
  return 0;
}