#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
ll mod(ll a) {
	while (a < 0) a += 1000000007;
	return a % 1000000007;
}
ull mod(ull a) {
	return a % 1000000007;
}
int n;
ll a[500010], b[500010];
ll sa[500010], sb[500010];
ull l, ra, rb;
int main() {
	ios::sync_with_stdio(0);
	cin.tie(0), cout.tie(0);
	freopen("P5686_4.in", "r", stdin);
	freopen("a.out", "w", stdout);
	cin >> n;
	for (int i = 1; i <= n; i++) cin >> a[i];
	for (int i = 1; i <= n; i++) cin >> b[i];
	for (int i = 1; i <= n; i++) sa[i] = mod(sa[i - 1] + a[i]);
	for (int i = 1; i <= n; i++) sb[i] = mod(sb[i - 1] + b[i]);
	for (int i = 1; i <= n; i++) {
		l = mod(l + mod(sa[i] * sb[i]));
		ra = mod(ra + sa[i]);
		rb = mod(rb + sb[i]);
	}
	cout << mod(mod((n + 1)*l) - mod(ra * rb));
	return 0;
}

(附提交记录)