#include <cstdio>
#include <unordered_map>

using namespace std;

int n, sum;
unordered_map <long long, bool> h;

int main() {
	int i;
	long long x;
	
	freopen ("dtcsu.in", "r", stdin), freopen ("dtcsu.out", "w", stdout);
	for (i = 0; i < 276997; i++) {
		scanf ("%lld", &x);
		h[x] = true;
	}
	scanf ("%d", &n);
	for (i = 0; i < n; i++) {
		scanf ("%lld", &x);
		if (h[x] == 1)
			sum += 1;
	}
	
	printf ("%d\n", sum);
	
	return 0;
}