#include <bits/stdc++.h>
using namespace std;



int main(){
    int n;
    cin >> n;
    vector<pair<int,int>> a(n);

    for(auto& i : a)
        cin >> i.first;

    for(auto& i : a)
        cin >> i.second;

    sort(a.begin(), a.end());
    int t = 0;
    int ido = 0;
    for(int i = 0; i< n; i++){
        if(t >= a[i].first)
            ido += a[i].second;
        else if (a[i].second + t <= a[i].first)
            ido += a[i].second*2;
        else 
            ido += 2*(a[i].first - t) + a[i].second - a[i].first;
        
        t += a[i].second;
        
    }
    cout << ido;
    
}