import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.*;

public class Main {

    void solve() throws IOException {
        int nw = ni();
        int[] w = nia(nw);
        int nb = ni();
        int[] b = nia(nb);

        Arrays.sort(w);
        Arrays.sort(b);

        int ans = 0;

        int widx = nw - 1;
        int bidx = nb - 1;
        boolean flg = true;
        int size = Integer.MAX_VALUE;
        int tmp = 0;
        while (true) {
            if (flg) {
                while (widx >= 0 && w[widx] >= size) {
                    widx--;
                }
                if (widx < 0) {
                    break;
                }
                tmp++;
                size = w[widx];
                widx--;
            } else {
                while (bidx >= 0 && b[bidx] >= size) {
                    bidx--;
                }
                if (bidx < 0) {
                    break;
                }
                tmp++;
                size = b[bidx];
                bidx--;
            }
            flg = !flg;
        }
        ans = Math.max(ans, tmp);

        widx = nw - 1;
        bidx = nb - 1;
        flg = false;
        size = Integer.MAX_VALUE;
        tmp = 0;
        while (true) {
            if (flg) {
                while (widx >= 0 && w[widx] >= size) {
                    widx--;
                }
                if (widx < 0) {
                    break;
                }
                tmp++;
                size = w[widx];
                widx--;
            } else {
                while (bidx >= 0 && b[bidx] >= size) {
                    bidx--;
                }
                if (bidx < 0) {
                    break;
                }
                tmp++;
                size = b[bidx];
                bidx--;
            }
            flg = !flg;
        }
        ans = Math.max(ans, tmp);

        out.println(ans);
    }

    String ns() throws IOException {
        while (!tok.hasMoreTokens()) {
            tok = new StringTokenizer(in.readLine(), " ");
        }
        return tok.nextToken();
    }

    int ni() throws IOException {
        return Integer.parseInt(ns());
    }

    long nl() throws IOException {
        return Long.parseLong(ns());
    }

    double nd() throws IOException {
        return Double.parseDouble(ns());
    }

    String[] nsa(int n) throws IOException {
        String[] res = new String[n];
        for (int i = 0; i < n; i++) {
            res[i] = ns();
        }
        return res;
    }

    int[] nia(int n) throws IOException {
        int[] res = new int[n];
        for (int i = 0; i < n; i++) {
            res[i] = ni();
        }
        return res;
    }

    long[] nla(int n) throws IOException {
        long[] res = new long[n];
        for (int i = 0; i < n; i++) {
            res[i] = nl();
        }
        return res;
    }

    static BufferedReader in;
    static PrintWriter out;
    static StringTokenizer tok;

    public static void main(String[] args) throws IOException {
        in = new BufferedReader(new InputStreamReader(System.in));
        out = new PrintWriter(System.out);
        tok = new StringTokenizer("");
        Main main = new Main();
        main.solve();
        out.close();
    }
}