#include <bits/stdc++.h>
#define pb push_back
#define NMAX 1000005
#define x first
#define y second
#define ll long long
#define MOD 1000000007

using namespace std;

typedef pair<int,int> pii;

FILE* fin=fopen("dtcsu.in","r");
const unsigned maxb=10000192;
char buf[maxb];
unsigned ptr=maxb;

inline ll getInt(){
    ll nr=0;
    while(buf[ptr]<'0'||'9'<buf[ptr])
    if(++ptr>=maxb)
        fread(buf,maxb,1,fin),ptr=0;
    while('0'<=buf[ptr]&&buf[ptr]<='9'){
        nr=nr*10+buf[ptr]-'0';
        if(++ptr>=maxb)
            fread(buf,maxb,1,fin),ptr=0;
    }
    return nr;
}
ofstream fout("dtcsu.out");

unordered_set<ll> mp;

int main() {
	int i,q,nr=0;
	ll x;

	for(i=1;i<=276997;++i) {
		x=getInt();

		while(!(x&1)) x>>=1;

		mp.insert(x);
	}

	q=getInt();
	while(q--) {
		x=getInt();

		while(!(x&1)) x>>=1;

		if(mp.find(x)!=mp.end()) ++nr;
	}

	fout<<nr;

	return 0;
}