#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

long long DP[1000001];

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];

	bool BW;

	BW = true;
	int cntW=1;
	for (int i = W.back() -1; i > 0; i--) {
		if (BW) {
			if (find(B.begin(), B.end(), i)!=B.end()) {
				BW = !BW;
				cntW++;
			}
		}
		else {
			if (find(W.begin(), W.end(), i)!=W.end()) {
				BW = !BW;
				cntW++;
			}
		}
	}

	BW = false;
	int cntB=1;
	for (int i = B.back() - 1; i > 0; i--) {
		if (BW) {
			if (find(B.begin(), B.end(), i) != B.end()) {
				BW = !BW;
				cntB++;
			}
		}
		else {
			if (find(W.begin(), W.end(), i) != W.end()) {
				BW = !BW;
				cntB++;
			}
		}
	}


	cout << max(cntW,cntB) << endl;

    return 0;
}