public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  ArrayList < Integer > list = new ArrayList < > ( ) ;
  int num = scanner . nextInt ( ) ;
  for ( int i = 0 ;
  i < num ;
  i ++ ) {
    list . add ( scanner . nextInt ( ) ) ;
  }
  scanner . close ( ) ;
  Collections . sort ( list ) ;
  int stock = 0 ;
  int count = 0 ;
  int stockNum = 0 ;
  for ( int i : list ) {
    if ( stock != i ) {
      stock = i ;
      count = i ;
    }
    count -- ;
    if ( count == 0 ) {
      stockNum += stock ;
    }
  }
  System . out . println ( list . size ( ) - stockNum ) ;
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; ArrayList < Integer > list = new ArrayList < > ( ) ; int num = scanner . nextInt ( ) ; for ( int i = 0 ; i < num ; i ++ ) { list . add ( scanner . nextInt ( ) ) ; } scanner . close ( ) ; Collections . sort ( list ) ; int stock = 0 ; int count = 0 ; int stockNum = 0 ; for ( int i : list ) { if ( stock != i ) { stock = i ; count = i ; } count -- ; if ( count == 0 ) { stockNum += stock ; } } System . out . println ( list . size ( ) - stockNum ) ; }
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