#include <bits/stdc++.h>
using namespace std;
int cnt(vector<int> x, vector<int> y) {
	int s = x.size();
	int t = y.size();
	int ret = 0;
	int i = 0, j = 0;
	int cur = 1000000000;
	while(true) {
		while(i < s && x[i] >= cur) {
			i++;
		}
		if(i >= s) {
			return ret;
		}
		cur = x[i];
		ret++;
		i++;
		while(j < t && y[j] >= cur) {
			j++;
		}
		if(j >= t) {
			return ret;
		}
		cur = y[j];
		ret++;
		j++;
	}
}
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);  
	int n;
	cin >> n;
	vector<int> w(n);
	for(int i = 0; i < n; i++) {
		cin >> w[i];
	}
	int m;
	cin >> m;
	vector<int> b(m);
	for(int i = 0; i < m; i++) {
		cin >> b[i];
	}
	sort(w.begin(), w.end(), greater<int>());
	sort(b.begin(), b.end(), greater<int>());
	cout << max(cnt(b, w), cnt(w, b)) << endl;
	return 0;	
}