import java.io.*;
import java.util.*;
import static java.lang.System.*;
import java.math.*;

public class Main {
	static FastScanner sc = new FastScanner(System.in);
	public static void main(String[] args) {
		int nw = sc.nextInt();
		int[] white = new int[nw];
		for (int i=0; i<nw; i++) {white[i] = sc.nextInt();}
		Arrays.sort(white);
		int nb = sc.nextInt();
		int[] black = new int[nb];
		for (int i=0; i<nb; i++) {black[i] = sc.nextInt();}
		Arrays.sort(black);
		
		
		
		int w_pos = nw-1; 
		int b_pos = nb-1;
		int top = Integer.MAX_VALUE;
		int i;
		int w_base_num = 0;
		while (true) {
			
			for (i=w_pos; i>=0; i--) {
				if (white[i] < top) {
					top = white[i];
					w_base_num++;
					break;
				}
			}
			w_pos = i-1;
			if (w_pos < 0) {break;}
			
			for (i=b_pos; i>=0; i--) {
				if (black[i] < top) {
					top = black[i];
					w_base_num++;
					break;
				}
			}
			b_pos = i-1;
			if (b_pos < 0) {break;}
			
		}
		
		w_pos = nw-1; 
		b_pos = nb-1;
		top = Integer.MAX_VALUE;
		int b_base_num = 0;
		while (true) {
			
			
			for (i=b_pos; i>=0; i--) {
				if (black[i] < top) {
					top = black[i];
					b_base_num++;
					break;
				}
			}
			b_pos = i-1;
			if (b_pos < 0) {break;}
			
			
			for (i=w_pos; i>=0; i--) {
				if (white[i] < top) {
					top = white[i];
					b_base_num++;
					break;
				}
			}
			w_pos = i-1;
			if (w_pos < 0) {break;}
		}
		
		
		
		
		out.println(Math.max(b_base_num,w_base_num));
	}
}



class FastScanner implements Closeable {
	private final InputStream in;
	private final byte[] buffer = new byte[1024];
	private int ptr = 0;
	private int buflen = 0;
	public FastScanner(InputStream in) {this.in = in;}
	private boolean hasNextByte() {
		if (ptr < buflen) {return true;}
		else{
			ptr = 0;
			try {buflen = in.read(buffer);}
			catch (IOException e) {e.printStackTrace();}
			if (buflen <= 0) {return false;}
		}
		return true;
	}
	private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
	private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
	public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
	public String next() {
		if (!hasNext()) throw new NoSuchElementException();
		StringBuilder sb = new StringBuilder();
		int b = readByte();
		while(isPrintableChar(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	public long nextLong() {
		if (!hasNext()) throw new NoSuchElementException();
		long n = 0;
		boolean minus = false;
		int b = readByte();
		if (b == '-') {
			minus = true;
			b = readByte();
		}
		if (b < '0' || '9' < b) {throw new NumberFormatException();}
		while(true){
			if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			}else if(b == -1 || !isPrintableChar(b)){return minus ? -n : n;}
			else{throw new NumberFormatException();}
			b = readByte();
		}
	}
	public int nextInt() {
		long nl = nextLong();
		if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
		return (int) nl;
	}
	public double nextDouble() { return Double.parseDouble(next());}
	public void close() {
		try {in.close();}
		catch (IOException e) {}
	}
}