#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], 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;    
    
}
