#define _CRT_SECURE_NO_WARNINGS
#include <cstdio>
#include <cstring>
#include <cmath>
#include <vector>
#include <list>
#include <string>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <algorithm>
#include <iostream>
#include <sstream>
#include <functional>
using namespace std;
typedef long long int llint;
const int INF = 1000000;
const llint LINF = 100000000;
int dp[100000];//何番目
int black[10000] = { 0 }, bn, wn;
int white[10000] = { 0 };

int main() {
	int fl;
	cin >> wn;
	for (int i = 0; i < wn; i++) {
		cin >> white[i];
	}
	cin >> bn;
	for (int i = 0; i < bn; i++) {
		cin >> black[i];
	}
	int ans = 1;
	sort(black, black + bn,greater<int>());
	sort(white, white + wn,greater<int>());
	dp[0] = max(black[0], white[0]);
	if (dp[0] == black[0])fl = 1;
	else { fl = 2; }
	for (int i = 1; i < bn*wn; i++) {
		if (fl = 1 && dp[i - 1]>white[i]&&white[i]!=0) { dp[i] = white[i]; ans++; fl = 2; }
		else if (fl = 2 && dp[i - 1]>black[i]&&black[i]!=0) { dp[i] = black[i]; ans++; fl = 1; }
	}
	
	cout << ans << endl;
	
	return 0;
}