Problem C
Journal Editing

David is writing an article for the Bulletin of the Association of Proof Completions. In his article, he proves several theorems. For every theorem, David came up with a proof. Since David is a very eager student, he even came up with multiple proofs for some of the theorems. As usual, a proof for a theorem may depend on a number of other theorems.

The article has to be as short as possible to publish it, and David only really cares about the main theorem, Theorem $0$. In order to achieve this, he has estimated the number of words he will need for every proof. Can you help David find the shortest possible length of his article?

Input

• A single line containing $1\le n\le 20$, the number of theorems.

• For each theorem:

  • A single line containing $1\le p_i\le 10$, the number of proofs for the $i$th theorem.

  • $p_i$ lines, each of the form $l$, $k$, $d_0,\dots ,d_{k-1}$, where $0\le l\le {10}^6$ is the length of the proof, $0\le k\le n-1$ is the number of theorems the proof depends on, and the $0\le d_i\le n-1$ are the numbers of the theorems the proof depends on.

Output

Print one line with a single integer, the shortest possible length of David’s article.

2
2
10 0
3 1 1
1
4 1 0

10

4
2
1 2 1 3
5 1 2
1
2 0
1
0 0
2
2 0
1 1 1

4