#include <bits/stdc++.h>

using namespace std;

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

typedef unsigned long long int ull;

unordered_set< ull > uSet;

int main() {
    ios::sync_with_stdio(false); in.tie(0); out.tie(0);

    for (int i = 1; i <= 276997; ++i) {
        ull nr; in >> nr;
        if (nr % 2LL != 0LL) {
            uSet.insert(nr);
        }
    }

    ull ans = 0;

    int Q; in >> Q;
    while (Q--) {
        ull n; in >> n;

        if (n % 2LL == 0LL) {
            n /= (n & (-n));
        }

        if (uSet.find(n) != uSet.end()) {
            ++ans;
        }
    }

    out << ans << "\n";

    in.close(); out.close();

    return 0;
}