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import numpy as np
import math


def lcm(a, b):
	a = a // math.gcd(a, b)
	return a*b


def div(a, b):
	(p, q) = a
	q = q * b
	g = math.gcd(p, q)
	return (p // g, q // g)


def add(a, b):
	(p, q) = a
	(x, y) = b
	
	return (p*y + q*x, q*y)


def full_lcm(vals):
	res = 1
	
	for (p, q) in vals:
		if p == 0:
			continue
		res = lcm(res, q)
	
	return res


def main():
	n = int(input())
	
	v = [[]]
	vals = [(0, 1) for _ in range(n+1)]
	vals[1] = (1, 1)
	
	for i in range(1, n+1):
		l = input().split(' ')
		v.append([int(x) for x in l[1:]])
	
	for i in range(1, n+1):
		deg = len(v[i])
		
		if vals[i][0] == 0 or deg == 0:
			vals[i] = (0, 1)
			continue
		
		vals[i] = div(vals[i], deg)
		
		for x in v[i]:
			vals[x] = add(vals[x], vals[i])
	
	print(full_lcm(vals))

if __name__=='__main__':
	main()