#include<stdio.h>
#define N 100001

int linersearch(int * ,int ,int);

int main (){
  int n,i,S[N],q,key,num=0;
  scanf("%d",&n);
  for(i=0;i<n;i++){
    scanf("%d",&S[i]);
  }
  scanf("%d",&q);
  for(i=0;i<q;i++){
    scanf("%d",&key);
    //if(linersearch(S,n,key)!=0)
    num=num+linersearch(S,n,key);
  }
  printf("%d\n",num);
 
  return 0;
}

int linersearch(int A[],int n,int key){
  int i=0;
  A[n]=key;
  while(i!=n){
    if(A[i]==key)
      break;
    i++;
  }
  if(i==n)return 0;
  else return 1;

}

