import sys

row1 = [int(row_temp) for row_temp in input().strip(). split(' ')]
row2 = [int(row_temp) for row_temp in input().strip(). split(' ')]
row3 = [int(row_temp) for row_temp in input().strip(). split(' ')]

s = [
	row1,
	row2,
	row3
]

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

def calc_cost(matrix, s):
	sum_cost = 0

	for row in range(3):
		for col in range(3):
			sum_cost += abs(matrix[row][col] - s[row][col])

	return sum_cost

min_cost = calc_cost(s_all[0], s)

for i in range(1, 8):
	new_cost = calc_cost(s_all[i], s)

	if new_cost < min_cost:
		min_cost = new_cost

print(min_cost)