#define _USE_MATH_DEFINES
#include <algorithm>
#include <cstdio>
#include <functional>
#include <iostream>
#include <cfloat>
#include <climits>
#include <cstring>
#include <cmath>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <time.h>
#include <vector>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> i_i;
typedef pair<ll, int> ll_i;
typedef pair<double, int> d_i;
typedef pair<ll, ll> ll_ll;
typedef pair<double, double> d_d;
struct edge { int u, v; ll w; };

ll MOD = 1000000007;
ll _MOD = 1000000009;
double EPS = 1e-10;

int f(vector<int> a, vector<int> b) {
	int l = 0;
	for (int k = 0; ; k++) {
		int i;
		for (i = 0; i < a.size() && a[i] <= l; i++);
		if (i == a.size()) return k;
		l = a[i];
		swap(a, b);
	}
}

int main() {
	int n; cin >> n;
	vector<int> a(n);
	for (int i = 0; i < n; i++)
		cin >> a[i];
	sort(a.begin(), a.end());
	int m; cin >> m;
	vector<int> b(m);
	for (int j = 0; j < m; j++)
		cin >> b[j];
	sort(b.begin(), b.end());
	cout << max(f(a, b), f(b, a)) << endl;
}