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

constexpr int mx = 5e5 + 3;
vector<int> tab[mx];
vector<int> wynik[mx];

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    int suma = 0, wolne = 0;
    int wolneNaTure;
    int dni, spotkania;
    cin >> dni >> spotkania;
    wynik[0].push_back(0);
    tab[0].push_back(0);

    tab[1].push_back(0);
    wynik[1].push_back(0);
    for (int i = 0; i < spotkania; i++) {
        tab[1].push_back(0);
        wynik[1].push_back(0);
    }

    int spotkaniaNaDzien;
    int x;

    for (int i = 2; i <= dni; i++) {
        cin >> spotkaniaNaDzien;
        tab[i].push_back(0);
        wynik[i].push_back(0);
        for (int j = 0; j < spotkaniaNaDzien; j++) {
            cin >> x;
            tab[i].push_back(x);
            wynik[i].push_back(0);
        }
    }

    for (int i = dni; i >= 1; i--) {
        wolneNaTure = 0;

        

        for (int j = 1; j < wynik[i].size(); j++) {    
            if (wynik[i][j] > 0)
            {
                if (tab[i][j] == 0) wolneNaTure += wynik[i][j];
                else wynik[i - 1][tab[i][j]] += wynik[i][j];
            }
            else {
                if (wolne > 0) {
                    --wolne;
                    ++wynik[i - 1][tab[i][j]];
                }
                else {
                    ++suma;
                    ++wynik[i - 1][tab[i][j]];
                }
                if (tab[i][j] == 0) ++wolneNaTure;
            }
        }
        wolne += wolneNaTure;
        
        //cout << "====STATYSTKI DZIEN=" << i << "====" << '\n';
        //cout << "SUMA=" << suma << '\n';
        //cout << "WOLNE=" << wolne << '\n';
    }
    /*cout << "OUT:\n\n";
    for (int i = 1; i <= 4; i++) {
        for (auto iter : wynik[i])
            cout << iter << ' ';
        cout << '\n';
    }*/

    cout << suma << '\n';

    return 0;
}