#include<iostream>
#include<cstdio>
#include<cstring>
#include <cstdlib>  
#include <cmath>   
#include<cctype>
#include<string>
#include<set>
#include<iomanip>
#include <map>
#include<algorithm>
#include <functional>
#include<vector>
#include<climits>
#include<stack>
#include<queue>
#include <deque>
#include <climits>
#include <typeinfo>
#include <utility> 
#define all(x) (x).begin(),(x).end()
#define rep(i,m,n) for(int i = m;i < n;++i)
#define pb push_back
#define fore(i,a) for(auto &i:a)
#define rrep(i,m,n) for(int i = m;i >= n;--i)
#define INF INT_MAX/2
using namespace std;
using ll = long long;
using R = double;
using Data = pair<ll, vector<int>>;
const ll MOD = 1e9 + 7;
const ll inf = 1LL << 50;
struct edge { ll from; ll to; ll cost; };

ll sum[101010];

int main() {
	ll n;
	cin >> n;
	rep(i, 0, n+1) {
		ll a;
		cin >> a;
		if (i) {
			sum[i] = sum[i - 1] + a;
		}
		else {
			sum[i] = a;
		}
		sum[i] %= MOD;
	}

	ll ans = 0;
	rep(i, 0, n + 1) {
		ll b;
		cin >> b;
		ans += b *sum[n - i];
		ans %= MOD;
	}
	cout << ans << endl;

	
	return 0;
}