#define _USE_MATH_DEFINES
#pragma region include
#include <iostream>
#include <iomanip>
#include <stdio.h>

#include <sstream>
#include <algorithm>
#include <iterator>
#include <cmath>
#include <complex>

#include <string>
#include <cstring>
#include <vector>
#include <bitset>

#include <queue>
#include <set>
#include <map>
#include <stack>
#include <list>

#include <ctime>
////
//#include <random>//
#pragma endregion //#include
/////////

#pragma region typedef
typedef long long LL;
typedef long double LD;
typedef unsigned long long ULL;
#pragma endregion //typedef
////定数
const int INF = (int)1e9;
const LL MOD = (LL)1e9+7;
const LL LINF = (LL)4e18+20;
const LD PI = acos(-1.0);
const double EPS = 1e-9;
/////////
using namespace::std;

vector<vector<int> > G,rG;
vector<bool> visit;
vector<int> dame;
const int NG = -1;
const int OK = 1;
//買えない商品を設定
//Gを使う
void dfs(int v){
	if( dame[v] == NG ){
		return;
	}
	dame[v] = NG;
	int size = G[v].size();
	for(int i=0;i<size;++i){
		int next = G[v][i];
		dfs(next);
	}
	return;
}

//必要な商品をさかのぼる
//rGを使う
int Rdfs(int v){
	if( dame[v] == OK ){
		return OK;
	}
	if( visit[v] ){//ループ
		dfs(v);
		return NG;
	}
	visit[v] = true;

	if( dame[v] == NG ){//買えない商品
		return NG;
	}
	

	int size = rG[v].size();
	for(int i=0;i<size;++i){
		int prev = rG[v][i];
		int res = Rdfs(prev);
		if( res == NG ){
			return res;
		}
	}

	dame[v] = OK;
	return OK;
}


void solve(){
	int N,M;
	/*
	N 商品
	M 条件が付いてる商品
	*/
	cin>> N >> M;
	
	G=vector<vector<int> >(N);
	rG=vector<vector<int> >(N);

	for(int i=0;i<M;++i){
		int g,r;
		cin>>g>>r;
		--g;//商品index
		for(int j=0;j<r;++j){
			int h;
			cin>>h;
			--h;
			G[h].push_back( g );
			rG[g].push_back( h );
		}
	}
	visit = vector<bool>(N,false);
	dame = vector<int>(N,0);
	for(int i=0;i<N;++i){
		if( visit[i] == false ){
			Rdfs(i);
		}
	}
	int ans = N;
	for(int i=0;i<N;++i){
		if( dame[i] == NG ){
			--ans;
		}
	}
	cout << ans << endl;
}

#pragma region main
signed main(void){
	std::cin.tie(0);
	std::ios::sync_with_stdio(false);
	std::cout << std::fixed;//小数を10進数表示
	cout << setprecision(16);//小数点以下の桁数を指定//coutとcerrで別	

	solve();
}
#pragma endregion //main()