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import math
from fractions import Fraction

n = int(input())

g = [None] * n
gr = [None] * n
p = [None] * n

p[0] = Fraction(1)

for i in range(n):
    gr[i] = []

for i in range(n):
    g[i] = [int(x)-1 for x in input().split()]
    del g[i][0]

    for j in g[i]:
        gr[j].append(i)

result = 1

for i in range(n):
    if (i != 0):
        p[i] = Fraction(0)

    for j in gr[i]:
        p[i] += p[j]

    if len(g[i]) > 0:
        p[i] /= len(g[i])
        result = math.lcm(result, p[i].denominator)


print(result)