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 PyPy3 (2.4.0) (judge verdict: Accepted)

N, C = ( int(i) for i in input().split())
dd = [[int(j) for j in input().split()] for i in range(C)]
cc = [[int(j) for j in input().split()] for i in range(N)]

cc0 = []
cc1 = []
cc2 = []
for i in range(N):
    for j in range(N):
        if (i + j)%3 == 0:
            cc0.append(cc[i][j])
        elif (i + j)%3 == 1:
            cc1.append(cc[i][j])
        else:
            cc2.append(cc[i][j])

ds = [[],[],[]]
for c1 in range(C):
    temp = 0
    for c2 in cc0:
        temp += dd[c2-1][c1]
    ds[0].append((temp,c1))
    temp = 0
    for c2 in cc1:
        temp += dd[c2-1][c1]
    ds[1].append((temp,c1))
    temp = 0
    for c2 in cc2:
        temp += dd[c2-1][c1]
    ds[2].append((temp,c1))

cut = []

for dss in ds:
    dss.sort()
    cut.append(dss[:3])

res = []
for i in range(3):
    for j in range(3):
        for k in range(3):
            dd0, c0 = cut[0][i]
            dd1, c1 = cut[1][j]
            dd2, c2 = cut[2][k]
            if c0 != c1 and c1 != c2 and c2 != c0:
                res.append(dd0 + dd1 + dd2)

res.sort()
print(res[0])