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H. DIY Tree

time limit per test

6 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputWilliam really likes puzzle kits. For one of his birthdays, his friends gifted him a complete undirected edge-weighted graph consisting of $$$n$$$ vertices.

He wants to build a spanning tree of this graph, such that for the first $$$k$$$ vertices the following condition is satisfied: the degree of a vertex with index $$$i$$$ does not exceed $$$d_i$$$. Vertices from $$$k + 1$$$ to $$$n$$$ may have any degree.

William wants you to find the minimum weight of a spanning tree that satisfies all the conditions.

A spanning tree is a subset of edges of a graph that forms a tree on all $$$n$$$ vertices of the graph. The weight of a spanning tree is defined as the sum of weights of all the edges included in a spanning tree.

Input

The first line of input contains two integers $$$n$$$, $$$k$$$ ($$$2 \leq n \leq 50$$$, $$$1 \leq k \leq min(n - 1, 5)$$$).

The second line contains $$$k$$$ integers $$$d_1, d_2, \ldots, d_k$$$ ($$$1 \leq d_i \leq n$$$).

The $$$i$$$-th of the next $$$n - 1$$$ lines contains $$$n - i$$$ integers $$$w_{i,i+1}, w_{i,i+2}, \ldots, w_{i,n}$$$ ($$$1 \leq w_{i,j} \leq 100$$$): weights of edges $$$(i,i+1),(i,i+2),\ldots,(i,n)$$$.

Output

Print one integer: the minimum weight of a spanning tree under given degree constraints for the first $$$k$$$ vertices.

Example

Input

10 5 5 3 4 2 1 29 49 33 12 55 15 32 62 37 61 26 15 58 15 22 8 58 37 16 9 39 20 14 58 10 15 40 3 19 55 53 13 37 44 52 23 59 58 4 69 80 29 89 28 48

Output

95

Codeforces (c) Copyright 2010-2021 Mike Mirzayanov

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