var solutions = [
  [8, 1, 6, 3, 5, 7, 4, 9, 2],
  [6, 1, 8, 7, 5, 3, 2, 9, 4],
  [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],
  [4, 9, 2, 3, 5, 7, 8, 1, 6],
  [2, 9, 4, 7, 5, 3, 6, 1, 8],
];


function processData(input) {
    //Enter your code here
    
      var g = input.trim().replace(/\n/g, ' ').split(" ").map(Number);
  var min = Infinity;
  solutions.forEach(function(s) {
    var changes = 0;
    for (var i = 0; i < g.length; i++) {
      changes += Math.abs(g[i] - s[i]);
    }
    min = changes < min ? changes : min;
  });
  console.log(min);

} 

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

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