#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vll = vector<ll>;
using vvll = vector<vll>;
#define all(A) A.begin(),A.end()
#define rep(i, n) for (ll i = 0; i < (ll) (n); i++)
int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    ll N;
    cin>>N;
    vector<pair<double,pair<ll,ll>>> T(N);
    rep(i,N){
        cin>>T[i].second.first;
    }
    rep(i,N){
        cin>>T[i].second.second;
        T[i].first=double(T[i].second.second-1)/double(T[i].second.first);
    }
    sort(all(T));
    reverse(all(T));
    ll X=1;
    ll an=0;
    ll mod=1e9+7;
    rep(i,N){
        an+=X*T[i].second.first;
        X*=T[i].second.second;
        an%=mod;
        X%=mod;
    }
    cout<<an<<endl;
}