10031.cpp

/*
 * AOJ 10031
 * AC
 */
#include <iostream>
#include <algorithm>

using namespace std;

int main() {
	int n, m, res = 0;
	int p[101000];
	cin >> n;
	for (int i = 0; i < n; ++i)
		cin >> p[i];
	sort(p, p+n);
	cin >> m;
	for (int i = 0; i < m; ++i) {
		int a = 0; cin >> a;
		res += binary_search(p, p+n, a);
	}
	cout << res << endl;

	return 0;
}