import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int Nw = scan.nextInt();
		int []W = new int[Nw];
		for(int i = 0; i < Nw; i++) {
			W[i] = scan.nextInt();
		}
		int Nb = scan.nextInt();
		int []B = new int[Nb];
		for(int i = 0; i < Nb; i++) {
			B[i] = scan.nextInt();
		}
		scan.close();
		Arrays.sort(W);
		Arrays.sort(B);

		// 白が一番下の場合
		int max1 = 1;
		int h = W[Nw - 1];
		int flag = 0;
		for(int i = Nw; i >= 0; i--) {
			switch(flag) {
			case 0:
				for(int j = Nb - 1; j >= 0; j--) {
					if(h > B[j]) {
						max1++;
						h = B[j];
						flag = 1;
						break;
					}
				}
				break;
			case 1:
				for(int j = Nw - 2; j >= 0; j--) {
					if(h > W[j]) {
						max1 ++;
						flag = 0;
						h = W[j];
						break;
					}
				}
				break;
			}
		}
		// 黒が一番下の場合
				int max2 = 1;
				int h2 = B[Nb - 1];
				int flag2 = 0;
				for(int i = Nb; i >= 0; i--) {
					switch(flag2) {
					case 0:
						for(int j = Nw - 1; j >= 0; j--) {
							if(h2 > W[j]) {
								max2++;
								h2 = W[j];
								flag2 = 1;
								break;
							}
						}
						break;
					case 1:
						for(int j = Nb - 2; j >= 0; j--) {
							if(h2 > B[j]) {
								max2 ++;
								flag2 = 0;
								h2 = B[j];
								break;
							}
						}
						break;
					}
				}
		int ans = Math.max(max1, max2);
		System.out.println(ans);


	}
}