#!/usr/bin/env python3
from fractions import Fraction
import math
def main():
N = int(input())
conveyor = [[]]
for i in range(N):
row = [int(x) for x in input().split()]
ri = row[0]
conveyor.append([])
for j in range(ri):
conveyor[i + 1].append(row[j + 1])
freq = [Fraction(0)] * (N + 1)
freq[1] = Fraction(1)
per = []
for i in range(1, N + 1):
if len(conveyor[i]) == 0 or freq[i] == 0:
continue
per.append(Fraction(len(conveyor[i]), freq[i]).numerator)
for j in conveyor[i]:
freq[j] += freq[i] * Fraction(1, len(conveyor[i]))
print(math.lcm(*per))
if __name__ == "__main__":
main()