#include <stdio.h>

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

int main()
{
    int i,n,A[10001],q,key,sum = 0;
    scanf("%d",&n);
    for (int i = 0; i < n; i++)
        scanf("%d",&A[i]);
    scanf("%d",&q);
    for (int i = 0; i < q; i++)
    {
        scanf("%d",&key);
        if(search(A,n,key)) sum++;
    }
    printf("%d\n",sum);
    return 0;
}
