// read array and map the elements to integer
var arr1 = readLine()!.characters.split(" ").map{Int(String($0))!} 
var arr2 = readLine()!.characters.split(" ").map{Int(String($0))!}
var arr3 = readLine()!.characters.split(" ").map{Int(String($0))!}

var arr = arr1 + arr2 + arr3

// All magic squares
var mags = [
[6, 1, 8, 7, 5, 3, 2, 9, 4],
[6, 7, 2, 1, 5, 9, 8, 3, 4],
[2, 7, 6, 9, 5, 1, 4, 3, 8],
[2, 9, 4, 7, 5, 3, 6, 1, 8],
[4, 9, 2, 3, 5, 7, 8, 1, 6],
[4, 3, 8, 9, 5, 1, 2, 7, 6],
[8, 3, 4, 1, 5, 9, 6, 7, 2],
[8, 1, 6, 3, 5, 7, 4, 9, 2]]

// variable to hold the sum of the array elements
var sum = 9999999

for (var i = 0; i < 8; i++) {
    var cost = 0
    for (var j = 0; j < 9; j++) {
        cost = cost + abs(arr[j] - mags[i][j])
    }
    if (cost < sum) {
        sum = cost
    }
}

// print the array elements
print(sum)