#include<stdio.h>

int main(){
    int i,n,A[10000+1],q,key,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;
}


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


