#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;



int main()
{
    vector<long long> array;
    vector<long long> zapr;
    int num, k = 0, m;
    int* lmin;
    cin >> num;
    array.resize(num);
    for (int i = 0; i < num; i++)
    {
        cin >> array[i];
    }
    sort(array.begin(), array.end());
    cin >> m;
    zapr.resize(m);
    for (int i = 0; i < m; i++)
    {
        cin >> zapr[i];
    }
    for (int i = 0; i < m; i++)
    {
        int left = 0;
        int right = num;
        int sav = -1;
        while (true)
        {
            int midd = (left + right) / 2;
            if (zapr[i] < array[midd])
            {
                right = midd - 1;
            }
            else if (zapr[i] > array[midd])
            {
                left = midd + 1;
            }
            else
            {
                sav = midd;
                right = midd - 1;
            }
            if (left > right)
            {
                break;
            }
        }
        if (sav != -1) { k += sav; }
        else
        {
            k--;
        }

    }
    cout << k;
}