#include <fstream>
#include <unordered_set>
using namespace std;

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

unordered_set<int64_t> s;
int Q, ans;

int main() {
  for (int i = 0; i < 276997; ++i) {
    int64_t x;
    fin >> x;
    if (x & 1) s.insert(x);
  }
  fin >> Q;
  while (Q--) {
    int64_t x;
    fin >> x;
    ans += (x && s.count(x / (x & -x)));
  }
  fout << ans << "\n";
  return 0;
}