# Enter your code here. Read input from STDIN. Print output to STDOUT
r1 = map(int,raw_input().strip().split(' '))
r2 = map(int,raw_input().strip().split(' '))
r3 = map(int,raw_input().strip().split(' '))
input = r1+r2+r3

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

print min([ sum([abs(x-y) for x, y in zip(input, ms)]) for ms in msX])