class BoomRecursion
{

   public static 
   void main ( String [] args ) 
   {
      boomAux(5) ;
   }


   static void boomAux( int i )
   {
      if ( i>0 )
      {
         System.out.println(i) ;
         boomAux( i-1 ) ;
      }
      else
      {
         System.out.println("Boom") ;
      }
   }


}