import sys
from math import fabs


matrix = [[int(x) for x in input().strip().split()],
          [int(x) for x in input().strip().split()],
          [int(x) for x in input().strip().split()]]


allmagic = [[[8,1,6],[3,5,7],[4,9,2]],
            [[8,3,4],[1,5,9],[6,7,2]],
            [[4,9,2],[3,5,7],[8,1,6]],
            [[4,3,8],[9,5,1],[2,7,6]],
            [[6,7,2],[1,5,9],[8,3,4]],
            [[6,1,8],[7,5,3],[2,9,4]],
            [[2,9,4],[7,5,3],[6,1,8]],
            [[2,7,6],[9,5,1],[4,3,8]]]

def edit_distance(matrix1, matrix2):
    dist = 0
    for i in range(len(matrix1)):
        for j in range(len(matrix1[i])):
            dist += abs(matrix1[i][j] - matrix2[i][j])
    return dist

dist = min(edit_distance(matrix,magic) for magic in allmagic)
print(dist)