#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>


#define MAX 100

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

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

	for (j = 0; j < N; j++) {
		if (S[j] == S[j - 1]) {
			continue;
		}
			for (i = 0; i < Q; i++) {
				for (k = 0; k < z; k++) {
					if (T[i] <= V[z]) {
						EOFcount++;
						break;
					}
				}
					if (EOFcount == 1) { break; }

					if (T[i] == S[j]) {//SがTと同じ値なら
					V[z] = T[i];
					z++;
					break;
				}
			}
		EOFcount = 0;
		}

	return z;
}



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;
}
