#include<stdio.h>

#define N 10000

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[N+1],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;
}

