from sys import stdin, stdout
from math import gcd
s = [int(x) for x in stdin.read().split()]
n = s[0]
p = 1
graf = []
for i in range(n):
    m = s[p]
    p += 1
    graf.append([0] * m)
    for j in range(m):
        graf[i][j] = s[p]-1
        p += 1
prod = 1
op = [0] * n
op[0] = 1
for w in range(n):
    if(len(graf[w]) == 0):
        continue;
    v = len(graf[w]) // gcd(len(graf[w]), op[w])
    for i in range(n):
        op[i] *= v
    prod *= v
    v = op[w]//len(graf[w])
    op[w] = 0
    for i in graf[w]:
        op[i] += v
stdout.write(str(prod)+'\n')