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// C5-WAL.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <map>
#include <vector>
#include <unordered_set>

using namespace std;

long long getGCD(long long n1, long long n2)
{
    if(n1 == 0)
    {
        return n2;
    }

    return getGCD(n2 % n1, n1);
}

long long getLCM(long long n1, long long n2)
{
    return (n1 / getGCD(n1, n2))* n2;
}

int main()
{
    int n;
    cin >> n;
    int r, temp;
    vector<int> outdeg(n);
    vector<int> indeg(n);
    unordered_set<int> processed;
    vector<vector<int>> outs;
    vector<vector<int>> ins(n);
    vector<long long> lcms(n);
    vector<int> toDo;
    for (int i = 0; i < n; i++) {
        cin >> r;
        vector<int> singleOut;
        for (int j = 0; j < r; j++) {
            cin >> temp;
            singleOut.push_back(temp-1);
            ins[temp-1].push_back(i);
        }
        if (r == 0) {
            toDo.push_back(i);
        }
        outs.push_back(singleOut);
        outdeg[i] = r;
    }
    for (int i = 0; i < n; i++) {
        indeg[i] = ins[i].size();
    }
    while (!toDo.empty())
    {
        vector<int> toDoCopy;
        for (int i = 0; i < toDo.size(); i++) {
            int label = toDo[i];
            long long lcm = 1;
            /*if (outs[label].size() != 0) {
                lcm = outs[label].size();
            }*/
            for (int j = 0; j < outs[label].size(); j++) {
                int out = outs[label][j];
                lcm = getLCM(lcms[out], lcm);
            }
            if (outs[label].size() == 0) {
                lcm = 1;
            }
            else {
                lcm = lcm * outs[label].size();
                //lcm = getLCM(lcm,outs[label].size());
                //lcm = lcm* getGCD(lcm, outs[label].size());
            }
            lcms[label] = lcm;
            for (int j = 0; j < ins[label].size(); j++) {
                int incoming = ins[label][j];
                outdeg[incoming]--;
                if (outdeg[incoming] == 0) {
                    toDoCopy.push_back(incoming);
                }
            }
        }
        toDo = toDoCopy;
    }
    
    if (lcms[0] == 0) {
        cout << 1;
    }
    else {
        cout << lcms[0];
    }
}

// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

// Tips for Getting Started: 
//   1. Use the Solution Explorer window to add/manage files
//   2. Use the Team Explorer window to connect to source control
//   3. Use the Output window to see build output and other messages
//   4. Use the Error List window to view errors
//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file