#include<stdio.h>

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 (S[i]==key)
         sum++;
   }

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

   return 0;
}