#include <stdio.h>

int Liner_Search(int a[], int n, int key) {
    int i = 0;
    a[n] = key;
    while (a[i] != key) i++;
    if (i == n) return 0;
    return 1;
}

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(Liner_Search(a, n, key)) sum++;
    }
    
    printf("%d\n", sum);
    
    return 0;
}