n = int(input())

nbh = {}
for i in range(1, n + 1):
    nbh[i] = []
    row = input().split(' ')
    r = int(row[0])

    for j in row[1:]:
        nbh[i] += [int(j)]

counters = [0]*(n + 1)


it = 0
while 1:
    v = 1
    while len(nbh[v]) != 0:
        counters[v] += 1
        counters[v] %= len(nbh[v])
        v = nbh[v][counters[v]]

    it += 1

    if sum(counters) == 0:
        break

print(it)