#include <stdio.h>
#include <unordered_map>
#define mod 123451

using namespace std;
typedef long long int ll;

int n,nr;
ll x;
unordered_map <ll,bool> mp;

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