# Enter your code here. Read input from STDIN. Print output to STDOUT
import itertools
x=[1,2,3,4,5,6,7,8,9]
l=list(itertools.permutations(x,9))
s=[]
for a in l:
    if (a[0]+a[3]+a[6])==15 and (a[1]+a[4]+a[7])==15 and (a[2]+a[5]+a[8])==15:
        if (a[0]+a[1]+a[2])==15 and (a[6]+a[7]+a[8])==15:
            if (a[0]+a[4]+a[8])==15 and a[2]+a[4]+a[6]==15:
                s.append(a)
t=[]
r=[]
c=[]
for _ in range(0,3):
    t.append(map(int,raw_input().split(' ')))
for val in t:
    for v in val:
        r.append(v)
for i in range(0,len(s)):
    cost=0
    for j in range(0,len(r)):
        if r[j]!=s[i][j]:
            cost+=abs(r[j]-s[i][j])
    c.append(cost)
print min(c)