//
// Created by liasa on 10/11/2025.
//
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define vll vector<ll>
const ll mod = 1e9 + 7;
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
ll n;
cin >> n;
vll h(n), w(n);
ll H = 0, W = 0;
for (ll i = 0; i < n; ++i)
cin >> h[i];
for (ll i = 0; i < n; ++i)
cin >> w[i];
for (ll i = 0; i < n; ++i) {
H = max(H, h[i]);
W += w[i];
}
H++, W++;
// ll ans = 0;
// for (ll x1 = 0; x1 < H; x1++) {
// for (ll x2 = x1 + 1; x2 < H; x2++) {
// for (ll y1 = 0; y1 < W; y1++) {
// for (ll y2 = y1 + 1; y2 < W; y2++) {
// // cout << x1 << " " << y1 << " " << x2 << " " << y2 << endl;
// ans++;
// ans%=mod;
// }
// }
// }
// }
ll ans = (H * (H - 1) / 2) % mod;
ans = (ans * W * (W - 1) / 2) % mod;
cout << ans;
}
