Union of Sets

Улаз

The first line contains an integer $n$ (1 \le n \le 10) — the number of sets.

The next $n$ lines describe the sets. Each line begins with $k$ (1 \le k \le 1000) — the number of elements in the set. Then $k$ integers follow: a_1, \ldots, a_k ( -10^9 \le a_i \le 10^9 ) — the elements of the set.

Излаз

Output a single number — the number of distinct elements that appear in at least one of the sets.

Примери