#include <bits/stdc++.h>
#define T ll tt ; cin>>tt ; while(tt--)
#define fast ios::sync_with_stdio(NULL); cin.tie(0); cout.tie(0);
#define endl '\n'
#define yes void (cout << "YES" << endl)
#define no void (cout << "NO" << endl)
#define pb push_back
#define F first
#define S second
#define ld long double
#define fixed(g) fixed<<setprecision(g)
#define ll long long
using namespace std;
const ll N = 2e6 + 9 ;
const ll oo = 1e9 + 7 ;
ll n , m , k , x , y , z , g , ans , sum , sum2 , cnt , dis[N] , sz , mn , a[N] , b[N] ;
bool ff , vis[N] ;
queue<pair<ll , ll> >q;
set<pair<ll , ll> >st;
vector<pair<ll , ll> >v[N] ;
int main(){
fast
cin >> n ;
for(ll i=0 ; i<n ; i++)cin >> a[i] ;
for(ll i=0 ; i<n ; i++)cin >> b[i] ;
for(ll i=0 ; i<n ; i++){
sum +=b[i];
sum %=oo ;
}
cout<<( ((sum*(sum+1))/2)%oo * ((a[0]*(a[0]+1))/2)%oo )%oo <<endl;
return 0 ;
}
