1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
#ifdef LOC
#include "debuglib.hpp"
#else
#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
#define deb(...)
#define DBP(...)
#endif
using namespace std;
using   ll         = long long;
using   vi         = vector<int>;
using   pii        = pair<int, int>;
#define pb           push_back
#define mp           make_pair
#define x            first
#define y            second
#define rep(i, b, e) for (int i = (b); i < (e); i++)
#define each(a, x)   for (auto& a : (x))
#define all(x)       (x).begin(), (x).end()
#define sz(x)        int((x).size())

int main() {
	cin.sync_with_stdio(0); cin.tie(0);
	cout << fixed << setprecision(12);

	int k, n1;
	cin >> k >> n1;

	vector<vector<int>> par(k), cnt(k);
	par[0].resize(n1, -1);
	cnt[0].resize(n1);

	rep(i, 1, k) {
		int ni; cin >> ni;
		par[i].resize(ni);
		cnt[i].resize(ni);
		each(p, par[i]) cin >> p, p--;
	}

	int ans = 0;

	for (int i = k-1; i >= 0; i--) {
		int alt = 0;
		rep(j, 0, sz(par[i])) {
			int c = max(cnt[i][j], 1);
			alt += c;
			if (par[i][j] != -1) {
				cnt[i-1][par[i][j]] += c;
			}
		}
		ans = max(ans, alt);
	}

	cout << ans << '\n';
}