#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<sstream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<climits>
#include<cmath>
#include<string>
#include<vector>
#include<set>
#include<map>
#include<queue>
#include<numeric>
#include<functional>
#include<algorithm>
#include<bitset>
#include<tuple>
#include<unordered_set>
#include<random>
#include<array>
#include<cassert>
using namespace std;
#define INF (1<<29)
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define all(v) v.begin(),v.end()
#define uniq(v) v.erase(unique(all(v)),v.end())

#define MOD 1000000007


int n;
int a[100001];
int b[100001];

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);

	cin >> n;
	rep(i, n+1)cin >> a[i];
	rep(i, n+1)cin >> b[i];

	long long s = 0;
	long long ans = 0;
	rep(i, n+1)(s += b[i]) %= MOD;

	rep(i,n+1) {
		ans += s * a[i];
		ans %= MOD;
		s = (s - b[n - i] + MOD) % MOD;
	}
	cout << ans << endl;


	
	return 0;
}