#include<stdio.h>
#define N 10000

int search(int *, int, int);

int main()
{ 
 int i, n, A[N], q, key, count=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;
  for (i=0;i<n;i++){
    if (A[i]==key) return 1;
  }
  return 0;
}