using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            string s1 = Console.ReadLine();
            string s2 = Console.ReadLine();
            string s3 = Console.ReadLine();
            string[] s1_temp = s1.Split(' ');
            string[] s2_temp = s2.Split(' ');
            string[] s3_temp = s3.Split(' ');
            int[][] arr = new int[3][];
            int cost = 0;
            int count = 0;
            arr[0] = Array.ConvertAll(s1_temp, Int32.Parse);
            arr[1] = Array.ConvertAll(s2_temp, Int32.Parse);
            arr[2] = Array.ConvertAll(s3_temp, Int32.Parse);
            string s4 = s1 + s2 + s3;
            s4 = s4.Replace(' ', '!');
            string s5 = "123456789";
            string s6 = "";
            foreach(char we in s5)
            {
                if (!(s4.Contains(we)))
                {
                    s6 += we;
                    count++;
                }

            }

            string s7 = "";
           
            foreach (char we in s4)
            {
                if (we != 33)
                {
                    int count1 = s4.Count(x => x == we);
                    s4 = s4.Replace(we, '!');
                    if (count1 > 1)
                    {
                        s7 += we;
                    }
                }
            }

            cost = Math.Abs(Convert.ToInt16(s7) - Convert.ToInt16(s6)); 
            //int c1 = arr[0][0] + arr[0][1] + arr[0][2];
            //int c2 =  arr[1][0] + arr[1][1] + arr[1][2];
            //int c3 = arr[2][0] + arr[2][1] + arr[2][2];
            //int r1 = arr[0][0] + arr[1][0] + arr[2][0];
            //int r2 = arr[0][1] + arr[1][1] + arr[2][1];
            //int r3 = arr[0][2] + arr[1][2] + arr[2][2];
            //int d1 = arr[0][0] + arr[1][1] + arr[2][2];
            //int d2 = arr[0][2] + arr[1][1] + arr[2][0];
            Console.WriteLine(cost);
        }
    }
}