#include<bits/stdc++.h>
using namespace std;
int n,m,a,h,book[10010],book1;
int  edge[1010][1010];
int main ()
{book[0]=1;
cin>>n>>m;
for(int i=1;i<=m;++i){
cin>>edge[i][0];
for(int j=1;j<=edge[i][0];++j)
{

cin>>a;
edge[i][a]=1;
h=max(a,h);}
for(int i=1;i<=m;++i)
{
	for(int j=1;j<=h;++j)
{if(!edge[i][j])
{for(int k=1;k<=i;++k)
	{
		book1=0;
		if(!edge[k][j]&&book[k]>book1)
		{
			book1=book[k];
		}
	}
	if(!book1){
			book[i]=book1+1;
			break;
	}

}
	
}
}


	
}


cout<<book[m]+1;
return 0;
}

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