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#include <bits/stdc++.h>
#include <cstdlib>

using namespace std;

int main()
{
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(NULL);

    int k, n1;
    cin >> k >> n1;

    int odp = n1;

    vector<vector<int>> input;
    input.reserve(k);
    input.push_back(vector<int>(n1, 0));

    vector<vector<int>> people;
    people.reserve(k);
    people.push_back(vector<int>(n1, 0));

    // input
    for (int _k = 1; _k < k; _k++)
    {
        int ni;
        cin >> ni;

        input.push_back(vector<int>());
        input.back().reserve(ni);

        people.push_back(vector<int>(ni, 0));

        for (int _ni = 0; _ni < ni; _ni++)
        {
            int a;
            cin >> a;

            input.back().push_back(a);
        }

        if (ni > odp)
        {
            odp = ni;
        }
    }

    for (int i = 0; i < people.back().size(); i++)
    {
        people.back()[i] = 1;
    }

    // solution
    for (int i = k - 2; i >= 0; i--)
    {
        for (int j = 0; j < people[i + 1].size(); j++)
        {
            if (input[i + 1][j] != 0)
            {
                people[i][input[i + 1][j] - 1] += people[i + 1][j];
            }
        }

        for (int j = 0; j < people[i].size(); j++)
        {
            if (people[i][j] == 0)
            {
                people[i][j] = 1;
            }
        }

        int people_needed = 0;
        for (int j = 0; j < people[i].size(); j++)
        {
            people_needed += people[i][j];
        }

        if (people_needed > odp)
        {
            odp = people_needed;
        }
    }

    // cout << "people" << endl;

    // for (auto p : people)
    // {
    //     for (auto el : p)
    //     {
    //         cout << el << " ";
    //     }

    //     cout << endl;
    // }

    cout << odp << endl;

    return 0;
}