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/*
Runda 1 - 
*/

#include<cstdio>
#include<iostream>
#include<algorithm>
#include<string>
#include<vector>
#include<cmath>
#include<queue>
#include<queue>
#include<stack>
#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
#include <chrono>

using namespace std;
using namespace __gnu_pbds;

typedef vector<int> VI;
typedef vector<VI> VVI;
typedef long long LL;
typedef unsigned long long ULL;
typedef long double LD;
typedef pair<int, int> PII;
typedef pair<LL, LL> PLL;
typedef vector<LL> VLL;
typedef vector<LD> VLD;
typedef vector<VLL > VVLL;
typedef vector<VLD > VVLD;
typedef vector<PII > VPII;
typedef vector<PLL > VPLL;
template<class T> using min_heap = priority_queue<T, vector<T>, greater<T>>;

#define FOR(x, b, e) for(int x=b; x<=(e); ++x)
#define FORD(x, b, e) for(int x=b; x>=(e); --x)
#define REP(x, n) for(int x=0; x<(n); ++x)
#define VAR(v, n) __typeof(n) v = (n)
#define ALL(c) (c).begin(), (c).end()
#define SIZE(x) ((int)(x).size())
#define FOREACH(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define PB push_back
#define ST first
#define ND second
#define THIS (*this)
#define LSB(x) (x & -x)
#define SQR(x) ((x)*(x))

int main() {
	ios_base::sync_with_stdio(0);
    cin.tie(NULL); cout.tie(NULL);
    int k, n; cin >> k >> n;
    VVI g(k - 1);
    VVI cnt(k); cnt[0].resize(n);
    REP(i, k - 1) {
        int ni; cin >> ni;
        g[i].resize(ni);
        REP(j, ni) cin >> g[i][j];
        cnt[i + 1].resize(ni);
    }
    int ans = 0;
    FORD(i, k - 1, 1) {
        int curr = 0;
        REP(j, cnt[i].size()) {
            curr += max(1, cnt[i][j]);
            if (g[i - 1][j]) cnt[i - 1][g[i - 1][j] - 1] += max(1, cnt[i][j]);
        }
        ans = max(ans, curr);
    }
    int tmp = 0;
    REP(i, cnt[0].size()) tmp += max(1, cnt[0][i]);
    ans = max(ans, tmp);
    cout << ans << "\n";

    return 0;
}