#include <map>
#include <stdio.h>
using namespace std;

#define file_in "dtcsu.in", "r"
#define file_out "dtcsu.out", "w"

map<int, int> h;

int main()
{
    FILE* _in = fopen(file_in),
        * _out = fopen(file_out);
    int q, w, c = 0;
    for(int i = 0; i < 276997; i++)
    {
        fscanf(_in, "%d", &w);
        h[w] = 1;
    }
    fscanf(_in, "%d", &q);
    for(int i = 0; i < q; i++)
    {
        fscanf(_in, "%d", &w);
        if(h[w] != 0)
            c++;
    }
    fprintf(_out, "%d \n", c);
    return 0;
}