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#include <iostream>
#include <vector>


using namespace std;


struct Day
{
	vector<int32_t>  m_vInput;
	vector<int32_t>  m_vSpiesCnt;
	size_t           m_iSize;

	Day() : m_iSize(0) {}

	void Init(size_t iSize)
	{
		m_iSize = iSize;

		m_vInput.clear();

		m_vSpiesCnt.clear();
		m_vSpiesCnt.resize(m_iSize, 0);
	}
};


static int iDaysCnt, iMaxSpies;

static vector<Day> vDays;


static void ReadData()
{
	int ni, aij;

	cin >> iDaysCnt >> ni;

	Day day;

	day.Init(ni);

	day.m_vInput.resize(ni, 0);

	vDays.clear();
	vDays.push_back(day);

	for (int i = 2; i <= iDaysCnt; ++i)
	{
		cin >> ni;

		day.Init(ni);

		for (int j = 1; j <= ni; ++j)
		{
			cin >> aij;

			day.m_vInput.push_back(aij);
		}

		vDays.push_back(day);
	}
}


static void Solve()
{
	int iLastDay = iDaysCnt - 1;

	iMaxSpies = static_cast<int>(vDays[iLastDay].m_iSize);

	int iNextDay = iLastDay;

	for (int iDay = iLastDay - 1; iDay >= 0; --iDay, --iNextDay)
	{
		Day & dayCurr = vDays[iDay];
		Day & dayNext = vDays[iNextDay];

		for (size_t i = 0; i < dayNext.m_iSize; ++i)
		{
			if (dayNext.m_vSpiesCnt[i] == 0)
			{
				dayNext.m_vSpiesCnt[i] = 1;
			}
		}

		for (size_t j = 0; j < dayNext.m_iSize; ++j)
		{
			int aij = dayNext.m_vInput[j];

			if (aij == 0)
				continue;

			dayCurr.m_vSpiesCnt[aij - 1] += dayNext.m_vSpiesCnt[j];
		}

		int iSpiesThisDay = 0;

		for (int32_t k : dayCurr.m_vSpiesCnt)
		{
			if (k == 0)
			{
				iSpiesThisDay++;
			}
			else
			{
				iSpiesThisDay += k;
			}
		}

		if (iSpiesThisDay > iMaxSpies)
		{
			iMaxSpies = iSpiesThisDay;
		}
	}
}


int main()
{
	// freopen("sample_input.txt", "r", stdin);
	// freopen("sample_output.txt", "w", stdout);

	ReadData();

	Solve();

	cout << iMaxSpies;
}