function processData(input) {
    //*****************
    // Define variables
    //*****************
    var inputs = input.split("\n"),
        baseMatrix = [],
        minDifference = -1,
        calculatedDifference = 0,
        solutions = [
            [[8,1,6], [3,5,7], [4,9,2]],
            [[4,9,2], [3,5,7], [8,1,6]],
            [[6,1,8], [7,5,3], [2,9,4]],
            [[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]]
        ];
    
    //******************
    // Initialize matrix
    //******************
    for(var i = 0; i < 3; i++)
        baseMatrix.push(inputs[i].trim().replace(/\s+/g, " ").split(" ").map(Number));
    
    //**********************************
    // Loop through all possible answers
    //**********************************
    for(var loop = 0, max_loops = solutions.length; loop < max_loops; loop++){
        // Reset variable
        calculatedDifference = 0;
        // Calculate differences
        for(var x = 0; x < 3; x++)
            for(var y = 0; y < 3; y++)
                calculatedDifference += Math.abs(baseMatrix[x][y] - solutions[loop][x][y]);
        // Replace difference if lower
        if(minDifference == -1)
            minDifference = calculatedDifference;
        else
            minDifference = calculatedDifference < minDifference ? calculatedDifference : minDifference;
    }
    
    //***************
    // Print solution
    //***************
    console.log(minDifference);
} 

process.stdin.resume();
process.stdin.setEncoding("ascii");
_input = "";
process.stdin.on("data", function (input) {
    _input += input;
});

process.stdin.on("end", function () {
   processData(_input);
});