#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<ll, ll>;
int main () {
    int N;
    cin >> N;
    vector<P> A(N);
    for (auto& [a, b] : A) {
        cin >> a;
    }
    for (auto& [a, b] : A) {
        cin >> b;
    }
    sort(A.begin(), A.end(), [](P a, P b) {return a.first + a.second * b.first > b.first + b.second * a.first;});
    ll ans = 0;
    ll m = 1e9 + 7;
    ll now = 1;
    for (auto [a, b] : A) {
        ans += a * now;
        ans %= m;
        now *= b;
        now %= m;
    }
    cout << ans << endl;
}