public static void main ( String [ ] args ) {
  Scanner scan = new Scanner ( System . in ) ;
  int N = scan . nextInt ( ) ;
  int A = String . valueOf ( N ) . length ( ) ;
  int B = 10 ;
  int have = N ;
  int sum = 0 ;
  for ( int i = 0 ;
  i < ( A - 2 ) ;
  i ++ ) {
    B *= 10 ;
  }
  if ( N % B == 0 ) {
    sum = 10 ;
    System . out . println ( sum ) ;
    System . exit ( 0 ) ;
  }
  sum = N / B ;
  for ( ;
  ;
  ) {
    have = have - ( have / B ) * B ;
    B /= 10 ;
    if ( B == 0 ) {
      break ;
    }
    sum += have / B ;
  }
  System . out . println ( sum ) ;
}

public static void main ( String [ ] args ) { Scanner scan = new Scanner ( System . in ) ; int N = scan . nextInt ( ) ; int A = String . valueOf ( N ) . length ( ) ; int B = 10 ; int have = N ; int sum = 0 ; for ( int i = 0 ; i < ( A - 2 ) ; i ++ ) { B *= 10 ; } if ( N % B == 0 ) { sum = 10 ; System . out . println ( sum ) ; System . exit ( 0 ) ; } sum = N / B ; for ( ; ; ) { have = have - ( have / B ) * B ; B /= 10 ; if ( B == 0 ) { break ; } sum += have / B ; } System . out . println ( sum ) ; }
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