public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int ans = 0 ;
  int arr [ ] = new int [ 55 ] ;
  while ( n -- != 0 ) {
    int w = sc . nextInt ( ) ;
    int yes = 0 ;
    int mid = 100005 , j = - 1 ;
    for ( int i = 0 ;
    i < arr . length ;
    i ++ ) {
      if ( arr [ i ] == w ) {
        yes = 1 ;
        break ;
      }
      if ( arr [ i ] > w ) {
        if ( arr [ i ] - w < mid ) {
          mid = arr [ i ] - w ;
          j = i ;
        }
      }
      if ( arr [ i ] == 0 ) break ;
    }
    if ( yes == 0 && j != - 1 ) {
      arr [ j ] = w ;
    }
    if ( yes == 0 && j == - 1 ) {
      for ( int i = 0 ;
      i < arr . length ;
      i ++ ) {
        if ( arr [ i ] == 0 ) {
          arr [ i ] = w ;
          ans ++ ;
          break ;
        }
      }
    }
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int ans = 0 ; int arr [ ] = new int [ 55 ] ; while ( n -- != 0 ) { int w = sc . nextInt ( ) ; int yes = 0 ; int mid = 100005 , j = - 1 ; for ( int i = 0 ; i < arr . length ; i ++ ) { if ( arr [ i ] == w ) { yes = 1 ; break ; } if ( arr [ i ] > w ) { if ( arr [ i ] - w < mid ) { mid = arr [ i ] - w ; j = i ; } } if ( arr [ i ] == 0 ) break ; } if ( yes == 0 && j != - 1 ) { arr [ j ] = w ; } if ( yes == 0 && j == - 1 ) { for ( int i = 0 ; i < arr . length ; i ++ ) { if ( arr [ i ] == 0 ) { arr [ i ] = w ; ans ++ ; break ; } } } } System . out . println ( ans ) ; }
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