using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        var c = NList;
        var (n, m) = (c[0], c[1]);
        var tree = new List<int>[n];
        for (var i = 0; i < n; ++i) tree[i] = new List<int>();
        var refs = new int[n];
        for (var i = 0; i < m; ++i)
        {
            c = NList;
            var (g, _) = (c[0], c[1]);
            var a = NList;
            foreach (var ai in a)
            {
                tree[ai - 1].Add(g - 1);
                ++refs[g - 1];
            }
        }
        var q = new Queue<int>();
        var ans = 0;
        for (var i = 0; i < n; ++i)
        {
            if (refs[i] == 0) q.Enqueue(i);
        }
        while (q.Count > 0)
        {
            var cur = q.Dequeue();
            ++ans;
            foreach (var next in tree[cur])
            {
                --refs[next];
                if (refs[next] == 0)
                {
                    q.Enqueue(next);
                }
            }
        }
        WriteLine(ans);
    }
}