#include <bits/stdc++.h>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    
    int n, a, b, s = 0, r = 0;
    cin >> n;

    vector<vector<int>> w(n);
    vector<int> d(n, 0);

    for (int i = 0; i < n; i++)
    {
        cin >> a;

        for(int j = 0; j < a; j++)
        {
            cin >> b;
            
            w[i].push_back(b - 1);
        }
    }

    while (r == 0 or s != 0)
    {
        a = 0;
        
        while (w[a].size() != 0)
        {
            d[a]++;
            s++;

            if (d[a] == w[a].size())
            {
                d[a] = 0;
                s -= w[a].size();
            }

            a = w[a][d[a]];
        }
        
        r++;
    }

    cout << r << "\n";
}