Problem:
Score : 400 points

Problem Statement

There is a grid with N rows and N columns of squares. Let (i,j) be the square at the i-th row from the top and the j-th column from the left.

These squares have to be painted in one of the C colors from Color 1 to Color C. Initially, (i,j) is painted in Color c_{i,j}.

We say the grid is a good grid when the following condition is met for all i,j,x,y satisfying 1 \leq i,j,x,y \leq N:

If (i+j) \% 3=(x+y) \% 3, the color of (i,j) and the color of (x,y) are the same.

If (i+j) \% 3 \neq (x+y) \% 3, the color of (i,j) and the color of (x,y) are different.

Here, X \% Y represents X modulo Y.

We will repaint zero or more squares so that the grid will be a good grid.

For a square, the wrongness when the color of the square is X before repainting and Y after repainting, is D_{X,Y}.

Find the minimum possible sum of the wrongness of all the squares.

Constraints

1 \leq N \leq 500

3 \leq C \leq 30

1 \leq D_{i,j} \leq 1000 (i \neq j),D_{i,j}=0 (i=j)

1 \leq c_{i,j} \leq C

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N C
D_{1,1} ... D_{1,C}
:
D_{C,1} ... D_{C,C}
c_{1,1} ... c_{1,N}
:
c_{N,1} ... c_{N,N}

Output

If the minimum possible sum of the wrongness of all the squares is x, print x.

Sample Input 1

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

Sample Output 1

3

Repaint (1,1) to Color 2. The wrongness of (1,1) becomes D_{1,2}=1.

Repaint (1,2) to Color 3. The wrongness of (1,2) becomes D_{2,3}=1.

Repaint (2,2) to Color 1. The wrongness of (2,2) becomes D_{3,1}=1.

In this case, the sum of the wrongness of all the squares is 3.

Note that D_{i,j} \neq D_{j,i} is possible.

Sample Input 2

4 3
0 12 71
81 0 53
14 92 0
1 1 2 1
2 1 1 2
2 2 1 3
1 1 2 2

Sample Output 2

428

Solution in C# (Mono 4.6.2.0) (judge verdict: Time Limit Exceeded)

using System;
using System.Linq;

namespace abc099_d
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] x = Console.ReadLine().Split().Select(int.Parse).ToArray();
            int[,] d = new int[x[1], x[1]];
            for (int i = 0; i < x[1]; i++)
            {
                int[] a = Console.ReadLine().Split().Select(int.Parse).ToArray();
                for (int j = 0; j < x[1]; j++)
                {
                    d[i, j] = a[j];
                }
            }
            int[,] ban = new int[x[0], x[0]];
            for (int i = 0; i < x[0]; i++)
            {
                int[] a = Console.ReadLine().Split().Select(int.Parse).ToArray();
                for (int j = 0; j < x[0]; j++)
                {
                    ban[i, j] = a[j];
                }
            }
            int ret = int.MaxValue;
            for (int i = 0; i < Math.Pow(x[1], 3); i++)
            {
                int[] color = new int[3];
                for (int j = 0; j < 3; j++) color[j] = (int)(i / Math.Pow(x[1], j)) % x[1];
                if (color[0] == color[1] || color[1] == color[2] || color[2] == color[0]) continue;
                int now = 0;
                for (int j = 0; j < x[0]; j++)
                {
                    for (int k = 0; k < x[0]; k++)
                    {
                        now += d[ban[j, k] - 1, color[(j + k) % 3]];
                    }
                }
                ret = Math.Min(ret, now);
            }
            Console.WriteLine(ret);
        }
    }
}