#include<fstream>
#include<algorithm>

#define NMAX 276997

using namespace std;

ifstream fin("dtcsu.in");
ofstream fout("dtcsu.out");

long long v[NMAX];
int q,sol;

int main()
{
	for(long long i=0;i<NMAX;i++)
		fin>>v[i];
	fin>>q;
	for(int n;q;q--)
	{
		fin>>n;
		sol+=(binary_search(v,v+NMAX,n)==true);
	}
	fout<<sol;
	return 0;
}