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


int main() {
	ios_base::sync_with_stdio(0);
	int k,n;
	cin >> k >> n;
	vector<vector<int> > tab(k),s(k);
	vector<int> N(k);
	N[0]=n;
	tab[0].push_back(-1);
	s[0].push_back(-1);
	for (int j=0;j<N[0];j++) {
		tab[0].push_back(0);
		s[0].push_back(0);
	}
	for (int i=1;i<k;i++) {
		cin >> N[i];
		tab[i].push_back(-1);
		s[i].push_back(-1);
		for (int j=0;j<N[i];j++) {
			int a;
			cin >> a;
			tab[i].push_back(a);
			s[i].push_back(0);
		}
		
	}
	int m=0;
	for (int i=k-1;i>=0;i--) {
		int ile=0;
		for (int j=1;j<=N[i];j++) {
			if (s[i][j]==0)
				s[i][j]=1;
			if (tab[i][j]>0) {
				s[i-1][tab[i][j]]+=s[i][j];
			}
			ile += s[i][j];
		}
		if (ile>m)
			m=ile;
		//for (auto j : s[i])  	cout << j << " "; cout << endl;
	}
	cout << m << endl;
	return 0;
}