public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  int n = scanner . nextInt ( ) ;
  int l = String . valueOf ( n ) . length ( ) ;
  long c = 1 ;
  long sum = 0 ;
  int rem = n ;
  for ( int i = 0 ;
  i < l - 1 ;
  i ++ ) {
    int count = ( int ) ( 9 * Math . pow ( 10 , i ) ) ;
    rem -= count ;
    sum += count * c ;
    c ++ ;
  }
  sum += rem * c ;
  System . out . println ( sum ) ;
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; int n = scanner . nextInt ( ) ; int l = String . valueOf ( n ) . length ( ) ; long c = 1 ; long sum = 0 ; int rem = n ; for ( int i = 0 ; i < l - 1 ; i ++ ) { int count = ( int ) ( 9 * Math . pow ( 10 , i ) ) ; rem -= count ; sum += count * c ; c ++ ; } sum += rem * c ; System . out . println ( sum ) ; }
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