public static void main ( String [ ] args ) throws IOException {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int [ ] ar = new int [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) ar [ i ] = sc . nextInt ( ) ;
  Arrays . sort ( ar ) ;
  List < Integer > ll = new ArrayList < Integer > ( ) ;
  int i = 0 , val = 1 ;
  while ( val <= 3000 ) {
    while ( i < n && val < ar [ i ] ) ll . add ( val ++ ) ;
    val ++ ;
    i ++ ;
  }
  int sum = 0 ;
  ;
}

public static void main ( String [ ] args ) throws IOException { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int [ ] ar = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) ar [ i ] = sc . nextInt ( ) ; Arrays . sort ( ar ) ; List < Integer > ll = new ArrayList < Integer > ( ) ; int i = 0 , val = 1 ; while ( val <= 3000 ) { while ( i < n && val < ar [ i ] ) ll . add ( val ++ ) ; val ++ ; i ++ ; } int sum = 0 ; ; }
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