﻿ ABC167 C - Skill Up - Atcoder

Home

Score : $300$ points

Problem

Takahashi, who is a novice in competitive programming, wants to learn $M$ algorithms. Initially, his understanding level of each of the $M$ algorithms is $0$.

Takahashi is visiting a bookstore, where he finds $N$ books on algorithms. The $i$-th book ($1\leq i\leq N$) is sold for $C_i$ yen (the currency of Japan). If he buys and reads it, his understanding level of the $j$-th algorithm will increase by $A_{i,j}$ for each $j$ ($1\leq j\leq M$). There is no other way to increase the understanding levels of the algorithms.

Takahashi's objective is to make his understanding levels of all the $M$ algorithms $X$ or higher. Determine whether this objective is achievable. If it is achievable, find the minimum amount of money needed to achieve it.

Constraints

• All values in input are integers.
• $1\leq N, M\leq 12$
• $1\leq X\leq 10^5$
• $1\leq C_i \leq 10^5$
• $0\leq A_{i, j} \leq 10^5$

Input

Input is given from Standard Input in the following format:

$N$ $M$ $X$
$C_1$ $A_{1,1}$ $A_{1,2}$ $\cdots$ $A_{1,M}$
$C_2$ $A_{2,1}$ $A_{2,2}$ $\cdots$ $A_{2,M}$
$\vdots$
$C_N$ $A_{N,1}$ $A_{N,2}$ $\cdots$ $A_{N,M}$


Output

If the objective is not achievable, print -1; otherwise, print the minimum amount of money needed to achieve it.

Sample Input 1

3 3 10
60 2 2 4
70 8 7 9
50 2 3 9


Sample Output 1

120


Buying the second and third books makes his understanding levels of all the algorithms $10$ or higher, at the minimum cost possible.

Sample Input 2

3 3 10
100 3 1 4
100 1 5 9
100 2 6 5


Sample Output 2

-1


Buying all the books is still not enough to make his understanding levels of all the algorithms $10$ or higher.

Sample Input 3

8 5 22
100 3 7 5 3 1
164 4 5 2 7 8
334 7 2 7 2 9
234 4 7 2 8 2
541 5 4 3 3 6
235 4 8 6 9 7
394 3 6 1 6 2
872 8 4 3 7 2


Sample Output 3

1067