#include <stdio.h>
int linearSearch(int *,int,int);

int main()
{
  int i,n,A[10000],q,key,num;

  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(linearSearch(A,n,key)) num++;
  }

  printf("%d\n",num);

  return 0;
}

int linearSearch(int *A,int n,int key)
{
  int i=0;
  A[n]=key;
  while(A[i]!=key){
    i++;
  }
  if(i==n) return NOT_FOUND;
  else return i;
}