#include<stdio.h>
 
int search(int A[],int n,int k){
    int i=0;
    A[n]=k;
    while(A[i] != k)
        i++;
    return i != n;
} 
 
int main()
{
    int i,n,A[10000],q,k,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",&k);
        if(search(A,n,k))
            sum++;
    }
    printf("%d\n",sum);
     
    return 0;
}

