import math, sys

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

def func(A,B):
    return [abs(a-b) for a,b in zip(A,B) if abs(a-b)>=0]

t=[]
for  line in sys.stdin:
    t += [i for i in line if i in [str(i) for i in range(10)]]
    t = [int(i) for i in t]
 

l=[]
min_= 100
for i in a_ms:
    if min_ > sum(func(t,i)):
        min_ = sum(func(t,i))
    
print(min_)