import java.util.*;

public class Exercise127{
  public static void main (String[] args){

    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int[] w = new int[n];
    for(int i = 0; i < n; i++){
      w[i] = sc.nextInt();
    }
    Arrays.sort(w);
    n = sc.nextInt();
    int[] b = new int[n];
    for(int i = 0; i < n; i++){
      b[i] = sc.nextInt();
    }
    Arrays.sort(b);
    System.out.println(Math.max(build(w, b), build(b, w)));
	}
  private static int build(int[] first, int[] second){
    int top = first[first.length - 1];
    int count = 1;
    boolean f = true;
    for(int i = second.length - 1; i >= 0; i--){
      if(second[i] < top && f){
        top = second[i];
        count++;
        f = false;
        for(int j = first.length - 1; j >=0; j--){
          if(first[j] < top){
            top = first[j];
            count++;
            f = true;
            break;
          }
        }
      }
    }
    return count;
  }
}