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#!/usr/bin/python3.9

from fractions import Fraction
from math import lcm
from sys import exit

class Tas:
    def __init__(self, nr, out):
        self.nr = nr
        self.out = out
        self.tas_list = []
        self.input_list = []
        self.freq = 0

n = int(input())
t = []
t.append( Tas(0,0) )

def calc_freq(nr):
    ts = t[nr]
    if nr == 1:
        ts.freq = Fraction(1,ts.out)
    else:
        if len(ts.input_list) == 0:
            return
        if ts.out == 0:
            return
        suma = Fraction(0)
        for f in ts.input_list:
            suma = suma + f
        ts.freq = suma * Fraction(1,ts.out)
    for tas in ts.tas_list:
        t[tas].input_list.append(ts.freq)

for i in range(1,n+1):
    l = input().split(" ")
    k = int(l[0])
    ts = Tas(i,k)
    for j in range(1,k+1):
        nr = int(l[j])
        ts.tas_list.append(nr)
    t.append(ts)

if t[1].out == 0:
    print("1")
    exit()

for i in range(1,n+1):
    calc_freq(i)

res=1
for i in range(1,n+1):
    if t[i].out > 1 and t[i].freq != 0:
        res = lcm(res, t[i].freq.denominator)

print(res)