# include <fstream>
# include <cstring>
# include <cstdlib>
# include <algorithm>
using namespace std;
ifstream f("dtcsu.in");
ofstream g("dtcsu.out");
long long x,a[300000];
int i,j,q,VV;
char s[30];
int main ()
{
    for (i=1; i<=276997; ++i)
    {
        f.getline(s,20);
        a[i]=atoi(s);
    }
    f>>q; f.get ();
    for (i=1; i<=q; ++i)
    {
        f.getline(s,20);
        x=atoi(s);
        if (binary_search(a+1,a+276997+1,x)) ++VV;
    }
    g<<VV<<"\n";
    return 0;
}