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

s = []
for i in range(3):
    s += [int(i) for i in raw_input().split()]
    
s1 = [8, 1, 6, 3, 5, 7, 4, 9, 2]
s2 = [6, 1, 8, 7, 5, 3, 2, 9, 4]
s3 = [4, 9, 2, 3, 5, 7, 8, 1, 6]
s4 = [2, 9, 4, 7, 5, 3, 6, 1, 8]
s5 = [8, 3, 4, 1, 5, 9, 6, 7, 2]
s6 = [4, 3, 8, 9, 5, 1, 2, 7, 6]
s7 = [6, 7, 2, 1, 5, 9, 8, 3, 4]
s8 = [2, 7, 6, 9, 5, 1, 4, 3, 8]

l = []
for i in (s1, s2, s3, s4, s5, s6, s7, s8):
    l.append(sum([abs(x-y) for x, y in zip(i, s)]))
print min(l)