static int maxSelectionCount ( int a [ ] , int n ) {
  int res = 0 ;
  Arrays . sort ( a ) ;
  int select = 1 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( a [ i ] >= select ) {
      res ++ ;
      select ++ ;
    }
  }
  return res ;
}

static int maxSelectionCount ( int a [ ] , int n ) { int res = 0 ; Arrays . sort ( a ) ; int select = 1 ; for ( int i = 0 ; i < n ; i ++ ) { if ( a [ i ] >= select ) { res ++ ; select ++ ; } } return res ; }
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