#include <stdio.h>
 
int LinerSearch(int a[], int n, int key)
{
   int i = 0;
   a[n] = key;

   while (a[i] != key) i++;
   if (i == n) return 0;
   return 1;
}
 
int main()
{
   int i, n, a[10000+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(LinerSearch(a, n, key)) sum++;
    }
     
   printf("%d\n", sum);
     
   return 0;
}