#include<stdio.h>

int LinearSearch(int,int [],int);

int main(){
  int i,n,A[10001],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 LinearSearch(int n,int A[],int key){
  int i = 0;
  A[n] = key;
  while(A[i] != key){
    i++;
  }
  if(i == n)
    return -1;
  else return i;
 }


