squares = [[4,9,2,3,5,7,8,1,6],[2,7,6,9,5,1,4,3,8],[6,1,8,7,5,3,2,9,4],[8,3,4,1,5,9,6,7,2],                                    [2,9,4,7,5,3,6,1,8],[6,7,2,1,5,9,8,3,4],[8,1,6,3,5,7,4,9,2],[4,3,8,9,5,1,2,7,6]]
row1 = list(map(int, input().split()))
row2 = list(map(int, input().split()))
row3 = list(map(int, input().split()))
matrix = row1 + row2 + row3
min_cost = 90
cost = 0
for square in squares :
    cost = 0 
    for i in range(9) :
        cost += abs(square[i]- matrix[i])
    if cost < min_cost :
        min_cost = cost
print(min_cost)