#include <unordered_map>
#include <iostream>
#include <fstream>
using namespace std;
ifstream in("dtcsu.in");
ofstream out("dtcsu.out");
const int numnr = 276997;
unordered_map <int, bool> gasit;
int main()
{
    for(int i = 1; i <= numnr; i++)
    {
        int x;
        in >> x;
        gasit[x] = 1;
    }
    int q;
    in >> q;
    int nr = 0;
    for(int i = 1; i <= q; i++)
    {
        int x;
        in >> x;
        if(gasit[x] == 1)
            nr++;
    }
    out << nr << "\n";
    return 0;
}