#include <fstream>
#include <tr1/unordered_set>

int main() {
    std :: ifstream cin("dtcsu.in");
    std :: ofstream cout("dtcsu.out");
    int N, Ans = 0;
    long long X;
    std :: tr1 :: unordered_set <long long> S;
    for(N = 276997 ; N -- ; ) {
        cin >> X;
        if(X & 1)   S.insert(X);
    }
    for(cin >> N ; N -- ; ) {
        cin >> X;
        if(X == 0)  continue;
        if(! X&1 )  X /= X & (-X);
        if(S.count(X))  ++ Ans;
    }
    cout << Ans << ' ';
}