#include <fstream>
#include <cstdio>
#include <cctype>
#include <cstdlib>
#include <algorithm>
using namespace std;

FILE *fin = fopen("dtcsu.in", "r");
ofstream fout("dtcsu.out");

const int bsize = 1<<16; //bsize = dimensiunea blocurilor in care sparg fisierul de intrare
char buff[bsize];
int poz = bsize;

inline char next() //citeste urmatorul caracter
{
    if (poz == bsize) //daca am terminat de procesat blocul actual, mai citesc inca un bloc
    {
        fread(buff, 1, bsize, fin);
        poz = 0;
    }
    return buff[poz++];
}

long long nr() //citeste un numar pozitiv
{
    long long x = 0;
    char c;
    do
    {
        c = next();
    } while (isdigit(c) == 0); //sar peste spatii
    while (isdigit(c)) //citesc cifra cu cifra
    {
        x = x * 10 + c-48;
        c = next();
    }
    return x;
}

long long v[300000];

bool cb (long long x)
{
    int st = 1, dr = 276997, mij;
    while (st <= dr)
    {
        mij = (st+dr)>>1;
        if (v[mij] == x)
            return 1;
        if (v[mij] < x)
            st = mij + 1;
        else
            dr = mij - 1;
    }
    return 0;
}

int main()
{
    int q, i, rasp;
    long long n;

    for (i = 1; i<=276997; i++)
        v[i] = nr();
    sort(v+1, v+276997+1);

    q = nr();
    rasp = 0;
    for (i = 1; i<=q; i++)
    {
        n = nr();
        if (cb (n) == 1)
            rasp++;
    }
    fout << rasp;
    return 0;
}