#include <bits/stdc++.h>

using namespace std;
ifstream fin ("dtcsu.in");
ofstream fout ("dtcsu.out");
long long n, q, nr;
unordered_map <long long, bool> fr;

int main()
{
    while(nr < 276997){
        fin >> n;
        fr[n] = 1;
        nr++;
    }
    nr = 0;
    fin >> q;
    for(int i = 1; i <= q; i++){
        fin >> n;
        if(fr[n] == 1){
            nr++;
        }
    }
    fout << nr;
    return 0;
}