let sq1 = [[8, 1, 6], [3, 5, 7], [4, 9, 2]]
let sq2 = [[6, 1, 8], [7, 5, 3], [2, 9, 4]]
let sq3 = [[4, 9, 2], [3, 5, 7], [8, 1, 6]]
let sq4 = [[2, 9, 4], [7, 5, 3], [6, 1, 8]]
let sq5 = [[8, 3, 4], [1, 5, 9], [6, 7, 2]]
let sq6 = [[4, 3, 8], [9, 5, 1], [2, 7, 6]]
let sq7 = [[6, 7, 2], [1, 5, 9], [8, 3, 4]]
let sq8 = [[2, 7, 6], [9, 5, 1], [4, 3, 8]]

let squares = [sq1, sq2, sq3, sq4, sq5, sq6, sq7, sq8]

var cost = 0
var input = [[Int]]()


for i in 0...2 {
    
    let values = readLine()!.characters.split{$0 == " "}.map(String.init)
    var level = [Int]()
    level.append(Int(values[0])!)
    level.append(Int(values[1])!)
    level.append(Int(values[2])!)

    input.append(level)
}

var minimumCost = 100

for s in 0...7 {
    let currentSquare = squares[s]
    
    var cost = 0
    var movements = 0
    
    for r in 0...2 {
        for c in 0...2 {
            let templateValue = currentSquare[r][c]
            let inputValue = input[r][c]
            
            if (templateValue != inputValue) {
                movements += 1
                cost += abs(templateValue - inputValue)
            }
        }
    }
    
    //print("Movements : \(movements), cost: \(cost)")
    if (minimumCost > cost) {
        minimumCost = cost
    }
}

print(minimumCost)