/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    public static void main (String[] args) throws java.lang.Exception
    {
        // your code goes here
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(br.readLine());
        ArrayList<Integer> toy = new ArrayList<Integer>();
        int toy_sum = 0;
        for(String st:br.readLine().split(" ")){
            int t = Integer.parseInt(st);
            toy.add(t);
            toy_sum += t;
        }
        Collections.sort(toy,(a,b)->{return b-a;});
        int m = Integer.parseInt(br.readLine());
        ArrayList<Integer> box = new ArrayList<Integer>();
        for(String st:br.readLine().split(" ")){
            box.add(Integer.parseInt(st));
        }
        Collections.sort(box,(a,b)->{return b-a;});
        int min = 0;
        int max = m;
        int ans = -1;
        while(max>=min){
            int ave = (min+max)/2;
            if(check(new ArrayList<Integer>(box.subList(0,ave)),new ArrayList<Integer>(toy),toy_sum)){
                ans = ave;
                max = ave-1;
            }else{
                min = ave+1;
            }
        }
        System.out.println(ans);
    }
    public static boolean check(ArrayList<Integer> box,ArrayList<Integer> toy,int toy_sum){
        for(int b:box){
            toy_sum-=b;
        }
        if(toy_sum>0){
            return false;
        }
        for(int i=0;i<toy.size();i++){
            int idx = box.indexOf(toy.get(i));
            if(idx >= 0){
                toy.remove(i);
                i--;
                box.set(idx,0);
            }
        }
        Collections.sort(box,(a,b)->{return b-a;});
        int box_size = box.size();
        int toy_size = toy.size();
        start:for(int j=0;j<box_size;j++){
            ArrayList<Integer> t_box = new ArrayList<Integer>(box);
            for(int i=0;i<toy_size;i++){
                int bo = t_box.get(0);
                int n = toy.get((i+j)%toy_size);
                int idx = t_box.indexOf(n);
                if(idx >= 0){
                    t_box.set(idx,0);
                }else if(bo>=n){
                    t_box.set(0,bo-n);
                }else{
                    continue start;
                }
                Collections.sort(t_box,(a,b)->{return b-a;});
            }
            return true;
        }
        return false;
    }

}