#include <stdio.h>

int search(int A[], int n, int key);


int main(void)
{
	int i, n, A[10000], 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;
}


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

