#include<iostream>
#include<string.h>
#include<stdio.h>
#include<stdlib.h>
using namespace std;

int p[1000001];
int main()
{
	long n,q,i,x,rez=0,sf=0,c,nr,poz,j,ok;
	char a[1000];
	FILE *f,*g;
	f=fopen("dtcsu.in","r");
	g=fopen("dtcsu.out","w");
	for (i=1; i<=276997; i++)
	//for (i=1; i<=3; i++)
	{
		if (i>50000) fscanf(f,"%s",&a);
		else
		{
			fscanf(f,"%d",&x);
			nr=0;
			sf++;
			p[sf]=x;
		}
	}
	
	fscanf(f,"%d",&q);
	for (i=1; i<=q; i++)
	{
		fscanf(f,"%d",&x);
		poz=1;
		ok=0;
		while (poz<=sf && ok==0)
		{
			if (p[poz]==x)
				ok=1;
			poz++;
		}
		if (ok) rez++;
	}
	fprintf(g,"%d",rez);
	return 0;
}