#include<stdio.h>
 
int search(int A[], int n,int key){
 int i = 0;
 int c = 0;
 A[n] = key;
 while ( A[i] != key )
       i++;
  
 if( i != n ) 
    c = 1;
 
 return c;
}
 
int main(){
 
 int c = 0, i, n, A[1000+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;
}