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

vector<pair<int, int>> spot[500010];

int main() {
	ios_base::sync_with_stdio(0);
	int k, n1; cin >> k >> n1;
	
	while(n1--) {
		spot[1].push_back({0, 0});
	}
	
	for (int i = 2; i <= k; i++) {
		int n; cin >> n;
		while(n--) {
			int p; cin >> p;
			spot[i].push_back({p, 0});
		}
	}
	
	for (int i = k; i >= 1; i--) {
		for (auto &s : spot[i]) {
			if (s.second == 0)
				s.second = 1;
			
			int par = s.first;
			int num = s.second;
				
			if (par == 0)
				continue;
				
			spot[i-1][par-1].second += num;
		}
	}
	
	int res = 0;
	
	for (int i = 1; i <= k; i++) {
		int res_i = 0;
		for (auto &s : spot[i]) {
			res_i += s.second;
		}
		res = max(res, res_i);
	}
	
	cout << res << endl;
	
	return 0;
}