// A list of all 8 magic squares
let magicSquares: [[[Int]]] =
  [[[8,1,6],[3,5,7],[4,9,2]],  [[6,1,8],[7,5,3],[2,9,4]],
   [[4,9,2],[3,5,7],[8,1,6]],  [[2,9,4],[7,5,3],[6,1,8]],
   [[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]]]

// Square to build
var square = [[Int]]()

for _ in 1...3 {
  square.append(readLine()!.characters.split(" ").map({Int(String($0))!}))
}

func calculateCost(a: [[Int]], _ b: [[Int]]) -> Int {
  var cost = 0
  for (element1, element2) in zip(a.flatMap({$0}), b.flatMap({$0})) {
    cost += abs(element1 - element2)
  }
  return cost
}

var minCost = Int.max

for magicSquare in magicSquares {
  minCost = min(minCost, calculateCost(square, magicSquare))
}

print(minCost)