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

int T[101][2]; //licznik,mianownik
long long NWD(long long a,long long b){
    if (a < b)swap(a,b);
    while (b != 0){
        a = a % b;
        if (a < b)swap(a,b);
    }
    return a;
}
vector <int> Con[101];
pair <int,int> dodaj(pair<int,int> x,pair<int,int> y){
        long long licz = x.first * y.second + y.first * x.second;
        long long mian = x.second*y.second;
        long long nwd = NWD(licz,mian);
        licz /= nwd;
        mian /= nwd;
        //cout << x.first << " " << x.second << " " << y.first << " " << y.second << " " << licz << " " << x.first << " " << endl;
        return {licz,mian};
}
int main(){
    int n;
    scanf("%d",&n);
    for (int i = 1; i <= n;i++){
        int temp1,temp2;
        scanf("\n");
        scanf("%d",&temp1);
        for (int j = 0; j < temp1;j++){
            scanf("%d",&temp2);
            Con[i].push_back(temp2);
        }
    }
    T[1][0]=1;
    T[1][1]=1;
    long mianownik = 1;
    for (int i = 1;i <= n;i++){
        int x = Con[i].size();
        if (T[i][0] != 0 && x != 0){
            //cout << i <<" "<<T[i][0] <<" " <<T[i][1] <<" "<<mianownik <<" "<< NWD(T[i][1],mianownik) << endl;
            mianownik *= (T[i][1]*x/NWD(T[i][1]*x,mianownik));
            for (int j = 0; j < Con[i].size();j++){
                if (T[Con[i][j]][0] == 0){
                    T[Con[i][j]][0] = T[i][0];
                    T[Con[i][j]][1] = T[i][1]*x;
                    int nwd = NWD(T[Con[i][j]][0],T[Con[i][j]][1]);
                    T[Con[i][j]][0] /= nwd;
                    T[Con[i][j]][1] /= nwd;
                }
                else{
                    pair<int,int> m =dodaj({T[Con[i][j]][0],T[Con[i][j]][1]},{T[i][0],T[i][1]*x});
                    T[Con[i][j]][0] = m.first;
                    T[Con[i][j]][1] = m.second;
                }
            }
        }
    }
    cout << mianownik;


}