#include <iostream>
#include <tr1/unordered_map>
#include <fstream>

using namespace std;
using namespace tr1;

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

unordered_map <long long,bool> h;
long long i,q,ans,x;

int main()
{
    for(i=1; i<=276997; ++i)
    {
        fin>>x;
        h[x]=1;
    }
    fin>>q;
    while(q--)
    {
        fin>>x;
        if(h[x])
            ++ans;
    }
    fout<<ans;
}