possibleSolutions = {0:[[8,1,6],[3,5,7],[4,9,2]],
                     1:[[6,1,8],[7,5,3],[2,9,4]],
                     2:[[4,9,2],[3,5,7],[8,1,6]],
                     3:[[2,9,4],[7,5,3],[6,1,8]],
                     4:[[8,3,4],[1,5,9],[6,7,2]],
                     5:[[4,3,8],[9,5,1],[2,7,6]],
                     6:[[6,7,2],[1,5,9],[8,3,4]],
                     7:[[2,7,6],[9,5,1],[4,3,8]]}

l1=[int(temp) for temp in input().strip().split(' ')]
l2=[int(temp) for temp in input().strip().split(' ')]
l3=[int(temp) for temp in input().strip().split(' ')]
costsList=[]
for solution in possibleSolutions.keys():
    cost = 0
    matrix = possibleSolutions.get(solution)
    cost += abs(l1[0]-matrix[0][0]) + abs(l1[1]-matrix[0][1]) + abs(l1[2]-matrix[0][2]) 
    cost += abs(l2[0]-matrix[1][0]) + abs(l2[1]-matrix[1][1]) + abs(l2[2]-matrix[1][2]) 
    cost += abs(l3[0]-matrix[2][0]) + abs(l3[1]-matrix[2][1]) + abs(l3[2]-matrix[2][2])             
    costsList.append(cost)
    
print(min(costsList))