#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>


#define MAX 100000


int kensaku(int S[], int T[], int Q, int N)
{

	int i = 0, j = 0, k = 0, z = 0;
	int zcount = 0,EOFcount = 0, V[MAX];

	for (j = 0; j < N; j++) {
		for (i = 0; i < Q; i++) {
			if (T[i] == S[j]) {//TとSが同じ値なら
				for (k = 0; k < zcount; k++) {
					if (T[i] == V[k]) {//TとVが同じ値なら
						EOFcount++;
						break;
					}
				}
					if (EOFcount == 0) {
						V[z] = T[i];
						z++;
						zcount++;
						}
				EOFcount = 0;
			}//if文ここまで
		}
	}

	return zcount;
}



int main(void)
{
	int i;
	int n, q, count = 0;
	int s[MAX], t[MAX];

	/////一つ目の配列の要素数と要素/////
	scanf("%d", &n);

	for (i = 0; i < n; i++) {
		scanf("%d", &s[i]);
	}
	////////////////////////////////////

	/////二つ目の配列の要素数と要素/////
	scanf("%d", &q);

	for (i = 0; i < q; i++) {
		scanf("%d", &t[i]);
	}
	////////////////////////////////////

	printf("%d\n", count = kensaku(s, t, q, n));

	return 0;
}

