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

input = []
3.times do
    input += gets.split(' ').map(&:to_i)
end

min_diff = Float::INFINITY
magic_squares.each do |magic_square|
    diff = 0

    9.times do |i|
      diff += (input[i] - magic_square[i]).abs
    end
    
    min_diff = diff if diff < min_diff
end

puts min_diff