n = int(input())
tr = dict()
mx = -1
for i in range(n):
    s = input().split()
    tr[s[0]] = s[2:]
ans = 0
vse = set()
while len(tr) > 1:
    d = dict()
    mx = -1
    mi = 0
    md = []
    for i in tr:
        for j in tr[i]:
            if j not in d:
                d[j] = [1, i]
            else:
                d[j][0] += 1
                d[j].append(i)
    k = 0
    for i in d:
        if d[i][0] > mx and i not in vse:
            k = 1
            mx = d[i][0]
            mi = i
            md = d[i][1:]
    vse.add(mi)
    if k == 0:
        break
    gd = dict()
    for i in md:
        gd[i] = tr[i]
    tr = gd
    ans += 1
print(ans)