#include <stdio.h>

int search(int A[],int n, int key)
{
	int i = 0;
	A[n] = key;
	while(A[i] != key) i++;
	return i != n;
}

int main()
{
	int i,n,A[10000+1],q,key,sum = 0;
	
	scanf("%d",&n);
	for(i = 0; i < n; i++) scanf("%d",A + i);
	
	scanf("%d",&q);
	for(i = 0; i < q1; i++)
	{
		scanf("%d",&key);
		if(search(A,n,key)) sum++;
	}
	
	printf("%d\n",sum);
	
	return 0;
}