#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[10000], 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;
}