import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int Nw = sc.nextInt();
        int [] W = new int [Nw];
        for(int i=0; i<Nw; i++){
            W[i] = sc.nextInt();
        }
        int Nb = sc.nextInt();
        int [] B = new int [Nb];
        for(int i=0; i<Nb; i++){
            B[i] = sc.nextInt();
        }
        Arrays.sort(B);
        int rw=arrange(W,B,W[0]);
        int rb=arrange(B,W,B[0]);
        int ans=Math.max(rw,rb);
        System.out.println(ans);
    }
    static int arrange(int []a, int []b, int c){
        if(c>=b[b.length-1]){
            return 1;
        }else{
            for(int i=0; i<b.length; i++){
                if(c<b[i]){
                    c=b[i];
                    break;
                }
            }
            int x=1+arrange(b,a,c);
            return x;
        }
    }
}