#include <bits/stdc++.h>
using namespace std;
//#include<atcoder/all>
//using namespace atcoder;
using ll = long long int;
using ull = unsigned long long int;
using ld = long double;
constexpr ll MAX = 2000000000000000000;
constexpr ld PI = 3.14159265358979;
constexpr ll MOD = 1000000007;//2024948111;
ld dotorad(ld K){return PI * K / 180.0;}
ld radtodo(ld K){return K * 180.0 / PI;}
mt19937 mt;
void randinit(){srand((unsigned)time(NULL));mt = mt19937(rand());}
int main(){
    ll N;
    cin >> N;
    vector<tuple<ll,ll>> P;
    vector<ll> A(N),B(N);
    for(ll i = 0;i < N;i++){
        cin >> A[i];
    }
    for(ll i = 0;i < N;i++){
        cin >> B[i];
        P.emplace_back(A[i],B[i]);
    }
    auto compare=[](tuple<ll,ll> & lh, tuple<ll,ll>& rh) {return get<0>(lh) * (get<1>(rh) - 1) < (get<1>(lh) - 1) * get<0>(rh);};
    sort(P.begin(),P.end(),compare);
    ll ans = 0,x = 1;
    for(ll i = 0;i < N;i++){
        ll p = x * get<0>(P[i]);
        p %= MOD;
        x *= get<1>(P[i]);
        x %= MOD;
        ans += p;
        ans %= MOD;
    }
    cout << ans << endl;
}