#include<stdio.h>
 
int s[10000];
int n;
 
int linerSearch(int);
 
int main()
{
  int q, c=0, i;
  int t[500];
 
  scanf("%d", &n);
  for(i = 0; i < n; i++){
    scanf("%d", &s[i]);
  }
 
  scanf("%d", &q);
  for(i = 0; i < q; i++){
    scanf("%d", &t[i]);
  }
 
  for(i = 0; i < q; i++){
    if(1 == linerSearch(t[i])) c++;
  }
 
  printf("%d\n", c);
 
  return 0;
}
 
int linerSearch(int key)
{
  int i;
   
  i = 0;
  s[n] = key;
  while(s[i] != key) i++;
  if(i == n) return 0;
  else return 1;
}
