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

unordered_set <long long> mySet;

int Q, nr;
long long X;

class InputReader {
    public:
        InputReader() {}
        InputReader(const char *file_name) {
            input_file = fopen(file_name, "r");
            cursor = 0;
            fread(buffer, SIZE, 1, input_file);
        }
        inline InputReader &operator >>(long long &n) {
            while(buffer[cursor] < '0' || buffer[cursor] > '9') {
                advance();
            }
            n = 0;
            while('0' <= buffer[cursor] && buffer[cursor] <= '9') {
                n = n * 10 + buffer[cursor] - '0';
                advance();
            }
            return *this;
        }
    private:
        FILE *input_file;
        static const int SIZE = 1 << 17;
        int cursor;
        char buffer[SIZE];
        inline void advance() {
            ++ cursor;
            if(cursor == SIZE) {
                cursor = 0;
                fread(buffer, SIZE, 1, input_file);
            }
        }
};

int main(){

    //freopen("dtcsu.in" ,"r", stdin );
    InputReader fin("dtcsu.in");
    freopen("dtcsu.out","w", stdout);

    for(int i = 1; i <= 276997; i ++){
        //scanf("%lld", &X);
        fin >> X;

        if((X&1))
            mySet.insert(X);
    }

    //scanf("%d", &Q);
    fin >> Q;
    for(int i = 1; i <= Q; i ++){
        //scanf("%lld", &X);
        fin >> X;

        if(!(X&1) && (X&(-X)))
            X /= (X&(-X));

        if(mySet.count(X))
            nr ++;
    }

    printf("%lld\n", nr);

    fclose(stdin );
    fclose(stdout);

    return 0;
}