#!/bin/python3

first_row = [int(x) for x in input().strip().split(' ')]
second_row = [int(x) for x in input().strip().split(' ')]
third_row = [int(x) for x in input().strip().split(' ')]

arr = first_row + second_row + third_row

m1 = [2,7,6,9,5,1,4,3,8]
m2 = [2,9,4,7,5,3,6,1,8]
m3 = [6,1,8,7,5,3,2,9,4]
m4 = [6,7,2,1,5,9,8,3,4]
m5 = [4,9,2,3,5,7,8,1,6]
m6 = [4,3,8,9,5,1,2,7,6]
m7 = [8,3,4,1,5,9,6,7,2]
m8 = [8,1,6,3,5,7,4,9,2]

magic_squares = [m1,m2,m3,m4,m5,m6,m7,m8]

def cost(arr, square):
    cost = 0
    for i in range(9):
        cost += abs(arr[i] - square[i])
    return cost
    

smallest_cost = 100
for square in magic_squares:
    c = cost(arr, square)
    if c < smallest_cost:
        smallest_cost = c
print(smallest_cost)