#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<q;i++)
	{
		scanf("%d",&key);
		if(search(A,n,key))sum++;
	}
	printf("%d\n",sum);
	return 0;

}
