function processData(input) {
    //Enter your code here
    var square = input.split(/\s/).map(Number);
    var possibilities = [[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]];
    
    
    /*"[[8,4,2,6],[1,3,9,7],[6,8,4,2],[3,9,7,1],[5],[7,1,3,9],[4,2,6,8],[9,7,1,3],[2,6,8,4]]"*/
    
    
    var match = 0;

    var diff = 81;
    var arr = [];

    possibilities.forEach(function(item, i) {
        
        var locDiff = [];
        item.forEach(function(item2, j) {
        locDiff.push(square[j] === item[j] ? 0 : Math.abs(square[j] - item[j]));
        });
        locDiff = locDiff.reduce(function(p,c) { return p + c;});
          if (locDiff < diff) {
              diff = locDiff;
          }
    });
    
   
    console.log(diff);
    
} 

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

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