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


import sys
input = sys.stdin.readlines()
test = [[int(y) for y in x if y.isdigit()] for x in input]

costs = []

squares = [[[8, 1, 6], [3, 5, 7], [4, 9, 2]],
          [[6, 1, 8], [7, 5, 3], [2, 9, 4]],
          [[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]],
          [[2, 7, 6], [9, 5, 1], [4, 3, 8]],
          [[4, 9, 2], [3, 5, 7], [8, 1, 6]],
          [[2, 9, 4], [7, 5, 3], [6, 1, 8]]]
for i in squares:
	current_cost = 0
	current_cost += (abs(test[0][0]-i[0][0]))
	current_cost += (abs(test[0][1]-i[0][1]))
	current_cost += (abs(test[0][2]-i[0][2]))
	current_cost += (abs(test[1][0]-i[1][0]))
	current_cost += (abs(test[1][1]-i[1][1]))
	current_cost += (abs(test[1][2]-i[1][2]))
	current_cost += (abs(test[2][0]-i[2][0]))
	current_cost += (abs(test[2][1]-i[2][1]))
	current_cost += (abs(test[2][2]-i[2][2]))
	costs.append(current_cost)

print min(costs)