// Enter your code here 
var matrix = [[Int]]()
for _ in 0..<3 {
    matrix.append(readLine()!.characters.split(" ").map{Int(String($0))!})
}

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

var cost: Int?

for magicSquare in possibleMagicSquares {
    var currentCost = 0
    
    for i in 0..<magicSquare.count {
        for j in 0..<magicSquare.count {
            currentCost += abs(magicSquare[i][j] - matrix[i][j])
        }
    }
    
    if currentCost < cost || cost == nil {
        cost = currentCost
    }
}

if cost != nil {
    print(cost!)
}