#include <bits/stdc++.h>

using namespace std;

ifstream fin("dtcsu.in");
ofstream fout("dtcsu.out");

int q;
unordered_map<long long, int> M;

void Citire()
{
    int i, x, cnt = 0;
    for (i = 1; i <= 276997; i++)
    {
        fin >> x;
        M[x]++;
    }
    fin >> q;
    for (i = 1; i <= q; i++)
    {
        fin >> x;
        if (M.find(x) != M.end()) cnt++;
    }
    fout << cnt << "\n";
}

int main()
{
    Citire();
}