#include <iostream>
#include <fstream>
#include <unordered_map>
#include <set>
#include <iomanip>
#include <algorithm>
#include <bitset>
using namespace std;

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

set<long long> s;

int main() {
    ios_base::sync_with_stdio(false);
    fin.tie(NULL);
    for (int i = 1; i <= 276997; ++i) {
        long long number;
        fin >> number;
        s.insert(number);
    }
    int q;
    fin >> q;
    int ans = 0;
    for (int i = 1; i <= q; ++i) {
        long long number;
        fin >> number;
        if (s.count(number)) {
            ++ans;
           // fr.erase(number);
        }
    }
    fout << ans;
    return 0;
}