// read the integer n
var n = 3 //Int(readLine()!)!

// declare 2d array
var arr : [[Int]] = []
//var existing = [Int](count: 10, repeatedValue: 0)


for i in 0 ..< n {
    arr.append(readLine()!.characters.split(" ").map{Int(String($0))!})
//    arr.append(readline()!.characters.split(separator:maxSplits:omittingEmptySubsequences:)
}

var good : [[[Int]]] = [[[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]]]

func getDiff() -> Int {
    var diff = 0
    var minDiff = 999999999999

    for g in 0 ..< 8 {
        for i in 0 ..< n {
            for j in 0 ..< n {
                let number = arr[i][j]
//                print(number)
                diff += abs(number - good[g][i][j])
            }
        }
//        print("diff: ", diff)
        if diff < minDiff {
            minDiff = diff
        }
        diff = 0
    }

//    print("returning ", minDiff)
    return minDiff
}


print(getDiff())