#include <bits/stdc++.h>
#define all(vec) vec.begin(),vec.end()
using namespace std;
using ll=long long;
using P=pair<int,int>;
const ll INF=1LL<<30;
const ll LINF=1LL<<61;
const double eps=1e-9;
const ll MOD=1e9+7;
int main(){
    int n;cin>>n;
    ll ans=0;
    vector<ll> sum(n+10,0);
    for(int i=0;i<=n;i++){
        ll a;cin>>a;
        sum[i]+=a;
        sum[i]%=MOD;
        sum[i+1]=sum[i];
    }
    for(int i=0;i<=n;i++){
        ll b;cin>>b;
        ans+=b*sum[n-i];
        ans%=MOD;
    }
    cout<<ans<<endl;
}