using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Collections;

namespace BK
{
    class fc
    {
        private int MAX;
        private int[][] WuT;
        public fc() { }
        private Stack<int> CompSub;
        public fc(int[][] test)
        {
            CompSub = new Stack<int>();
            MAX = 0;
            WuT = test;
            List<int> NotUsedSet = new List<int>();//candidates
            List<int> UsedSet = new List<int>();
            for (int i = 0; i < WuT.GetLength(0); i++)
            {
                NotUsedSet.Add(i);
            }
            function(NotUsedSet, UsedSet);
            StreamWriter SW = new StreamWriter("clique.out");
            SW.WriteLine(MAX);
            SW.Close();
        }
        private List<int> RemoveFrom(int v, List<int> ToRemove)
        {
            var s = from q in ToRemove
                    where WuT[v].Contains(q)
                    select q;
            return s.ToList();
        }

        private void function(List<int> NotUsedSet, List<int> UsedSet)
        {
            while (NotUsedSet.Count != 0)
            {
                int v = NotUsedSet.First();
                CompSub.Push(v);
                List<int> NewUsedSet = UsedSet;
                List<int> NewNotUsedSet = NotUsedSet;
                NewNotUsedSet = RemoveFrom(v, NewNotUsedSet);
                NewUsedSet = RemoveFrom(v, NewUsedSet);
                if (NewNotUsedSet.Count == 0 && NewUsedSet.Count == 0)
                {
                    MAX = CompSub.Count > MAX ? CompSub.Count : MAX;
                }
                else
                {
                    function(NewNotUsedSet, NewUsedSet);
                }
                int qwe = CompSub.Pop();
                NotUsedSet.Remove(v);
                UsedSet.Add(v);
            }
        }
        class Program
        {
            static void Main(string[] args)
            {
                StreamReader SR = new StreamReader("clique.in");
                int n = int.Parse(SR.ReadLine());
                int[][] w0t = new int[n][];
                for (int i = 0; i < n; i++)
                {
                    string[] line = SR.ReadLine().Split(" ".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
                    int size = int.Parse(line[0]);
                    w0t[i] = new int[size];
                    for (int k = 0; k < line.Length - 1; k++)
                    {
                        int temp = int.Parse(line[k + 1]);
                        w0t[i][k] = temp;
                    }
                }
                new fc(w0t);
            }
        }
    }
}