i Guess Class Main Have to be Public!!!!
This run goog but gets Wrong Answer i Dont know why!!!!

import java.io.*;
import java.util.*;

public class Main {
    
    public static boolean Existe (int Vec[], int c,int Num)
    {
       for (int i=1;i<=c;i++)
           if (Num == Vec[i])
               return true;
       return false;
    }
    
    public static boolean Jolly  (int Vec[], int c)
    {
       while (true)
       {
          for (int i=1;i<c;i++)
          {
            int Aux = Math.abs((Vec[i]-Vec[i+1]));
            boolean Sw = Existe (Vec,c,Aux);
            if (!Sw) 
            {    
                return false;
            } 
            else
               return true;                              
          }
          return true;
       }    
    }
    
    public static void main(String[] args)
    {
       try
       {
          BufferedReader Leer = new BufferedReader (new FileReader (new File ("Hola.txt")));
          //  BufferedReader Leer = new BufferedReader (new InputStreamReader (System.in));
          while (true)
          {
             String Aux = Leer.readLine();
             StringTokenizer Cadena = new StringTokenizer (Aux);
             int c = 1;
             int Opc = Integer.parseInt (Cadena.nextToken());
             int Vec[] = new int [++Opc];
             while (Cadena.hasMoreTokens())
             {                 
                Vec[c] = Integer.parseInt (Cadena.nextToken());
                c++;
             }    
             c--;
             boolean Sw = Jolly(Vec,c);
            System.out.println (Sw ? "Jolly" : "Not jolly");
          }    
       }              
       catch (Exception e)
       {
          //System.out.println ("Fuck "+e);
       }
              
    }    
}