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#include <iostream>
#include <stdio.h>
#include <fstream>
#include<bits/stdc++.h>
#include <unordered_set>
using namespace std;
unordered_set <long long> v;
int main(){
ifstream fin("dtcsu.in");
ofstream fout("dtcsu.out");
long long a;
for(int i=0;i<276997;i++){
fin>>a;
if(a%2==1)
v.insert(a);
}
int n=0,m;
fin>>m;
for(int i=0;i<m;i++){
fin>>a;
if(a && v.find(a/(a&(-a)))!=v.end()){
n++;
}
}
fout<<n;
return 0;
}