n = int(input())
animals = [list(input().split()) for i in range(n)]
k = 0
max_k = 0
all_chars = []
for animal in animals:
    animal = set(animal[2:])
    all_chars.append(animal)

for i in range(n):
    for j in range(n):
        if i != j :
            k = len(all_chars[i] & all_chars[j])
            if k > max_k:
                max_k = k

print(max_k + 1)