#include "bits/stdc++.h"
using namespace std;

int calc(vector<int> a, vector<int> b){
	int acount = a.size() - 1;
	int bcount = b.size() - 1;
	int ret = 0;
	int pre = 99999999;
	while (true){
		while (acount >= 0 && a[acount] >= pre) acount--;
		if (acount < 0) return ret;
		pre = a[acount];
		acount--;
		ret++;

		while (bcount >= 0 && b[bcount] >= pre) bcount--;
		if (bcount < 0) return ret;
		pre = b[bcount];
		bcount--;
		ret++;
	}
}

int main(){
	int NW;
	cin >> NW;
	vector<int> W(NW);
	for (int i = 0; i < NW; i++)
	{
		cin >> W[i];
	}
	int NB;
	cin >> NB;
	vector<int> B(NB);
	for (int i = 0; i < NB; i++)
	{
		cin >> B[i];
	}
	sort(W.begin(), W.end());
	sort(B.begin(), B.end());
	int ans = max(calc(W, B), calc(B, W));
	cout << ans << endl;
}