#include <fstream>
#include <vector>
using namespace std;
ifstream in ("dtcsu.in");
ofstream out ("dtcsu.out");
vector <int> H[8192];
int main()
{
    for (int x, i = 1; i <= 276997; i++)
    {
        in >> x;
        if (x & 1) H[x % 8191].push_back(x);
    }
    int n, nr = 0; in >> n;
    for (int x, k = 1; k <= n; k++)
    {
        in >> x;
        x /= x & (-x);
        for (vector <int> :: iterator i = H[x % 8191].begin(), j = H[x % 8191].end(); i != j; )
            if (*i == x) { nr++; break; }
            else i++;
    }
    out << nr << '\n'; out.close(); return 0;
}