#include <iostream>
#include <set>
#include <fstream>
#include <queue>
#define mod 1000000007
using namespace std;
ofstream fout("dtcsu.out");
ifstream fin ("dtcsu.in" );
int n,rsp;
set <int> s;
unsigned long long k,cnt = 0,nr;
int main()
{
    for( int i = 1 ; i <= 276997 ; i++ )
    {
        fin>>cnt;
        s.insert( cnt );
    }
    fin>>n;
    for(int i = 1 ; i <= n ; i++)
    {
        fin>>cnt;
        if( s.find( cnt ) != s.end() ) nr++;
    }
    fout<<nr;
    return 0;
}