SOURCE #2

#include <iostream>
#include <vector>

int main()
{
    int n;

    std::cin >> n;

    std::vector<int> sent(n), recd(n);
    int t = n;

    for (int i = 0; i < n; i++)
    {
        std::cin >> sent[i];
    }

    for (int i = 0; i < n; i++)
    {
        std::cin >> recd[i];
    }

    for (int i = 0; i < t; i++)
        for (int k = 0; k < t; k++)
            if (sent[i] == recd[k])
            {
                sent.erase(sent.cbegin() + i);
                recd.erase(recd.cbegin() + k);
                i = 0;
                k = -1;
                t--;
            }

    std::cout << t;

    return 0;
}