#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=int(a);i<int(b);++i)
using namespace std;
typedef long long ll;
int INF = (1LL << 30) - 1;
int MOD = 1e9+7;
main(){
    int N;
    cin >> N;
    vector<ll> A(N+2),B(N+1);

    rep(i,0,N+1){
        int a;
        cin >> a;
        A[i+1] = A[i] + a;
    }
    rep(i,0,N+1){
        cin >> B[i];
    }
    ll sum = 0;
    rep(i,0,N+1){
        sum = (sum + B[i] * (A[N-i+1] % MOD) ) % MOD;
    }
    cout << sum << endl;
}