#include<stdio.h>

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

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;
}

