# Enter your code here. Read input from STDIN. Print output to STDOUT
import sys

import sys
AllMats = [([8,1,6],[3,5,7],[4,9,2]),([6,1,8],[7,5,3],[2,9,4]),([4,9,2],[3,5,7],[8,1,6]),([2,9,4],[7,5,3],[6,1,8]),([8,3,4],[1,5,9],[7,6,2]),([4,3,8],[9,5,1],[2,7,6]),([6,7,2],[1,5,9],[8,3,4]),([2,7,6],[9,5,1],[4,3,8])]

#row1 = map(int,raw_input().strip().split(' '))
#row2 = map(int,raw_input().strip().split(' '))
#row3 = map(int,raw_input().strip().split(' '))
matIn = []
matIn.append(map(int,raw_input().strip().split(' ')))
matIn.append(map(int,raw_input().strip().split(' ')))
matIn.append(map(int,raw_input().strip().split(' ')))
diff = 1000
ind = 10
for i,mat in enumerate(AllMats):
    diffT = 0
    for j in range(3):
        for k in range(3):
            diffT = diffT + abs((mat[j][k]) - (matIn[j][k]))
            #print i, diff
            #print "\n"
    if diffT < diff:
        diff =diffT
        ind = i
#chosenMat = AllMats[ind]
print diff