#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[10000+1],key,q,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(search(A,n,key)){
            sum++;
        }
    }
    printf("%d\n",sum);

    return 0;
}
