#include<stdio.h>

int search(int S[], int n, int key)
{
   int i = 0;
   S[n] = key;
   while (S[i]!=key){
      i++;
      if(i==n)
         return NOT_FOUND;
   }
   return i = n;
}

int main()
{
   int i, n, q, key, sum=0;
   int S[10001];

   scanf("%d", &n);
   for (i=0; i<n; i++)
      scanf("%d", &S[i]);

   scanf("%d", &q);
   for (i=0; i<n; i++){
      scanf("%d", &key);
      if (search(S, n, key)
         sum++;
   }

   printf("%d\n", sum);

   return 0;
}