public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  String N = sc . next ( ) ;
  int [ ] arr = new int [ N . length ( ) ] ;
  int max = 0 ;
  for ( int i = 0 ;
  i < N . length ( ) ;
  i ++ ) {
    arr [ i ] = N . charAt ( i ) - '0' ;
    max += arr [ i ] ;
  }
  for ( int i = 0 ;
  i < arr . length && arr [ i ] != 0 ;
  i ++ ) {
    int tmp = 0 ;
    for ( int j = 0 ;
    j < arr . length ;
    j ++ ) {
      if ( i == j ) {
        tmp += arr [ j ] - 1 + ( arr . length - j - 1 ) * 9 ;
        break ;
      }
      else {
        tmp += arr [ j ] ;
      }
    }
    max = Math . max ( max , tmp ) ;
  }
  out . println ( max ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; String N = sc . next ( ) ; int [ ] arr = new int [ N . length ( ) ] ; int max = 0 ; for ( int i = 0 ; i < N . length ( ) ; i ++ ) { arr [ i ] = N . charAt ( i ) - '0' ; max += arr [ i ] ; } for ( int i = 0 ; i < arr . length && arr [ i ] != 0 ; i ++ ) { int tmp = 0 ; for ( int j = 0 ; j < arr . length ; j ++ ) { if ( i == j ) { tmp += arr [ j ] - 1 + ( arr . length - j - 1 ) * 9 ; break ; } else { tmp += arr [ j ] ; } } max = Math . max ( max , tmp ) ; } out . println ( max ) ; }
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