public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  int N = scanner . nextInt ( ) ;
  int [ ] supportiveArray = {
    1 , 11 , 111 , 1111 , 11111 , 111111 };
    int [ ] repdigitArray = {
      1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 };
      ArrayList < Integer > repdigitList = new ArrayList < Integer > ( ) ;
      for ( int i = 0 ;
      i < 6 ;
      i ++ ) {
        int support = supportiveArray [ i ] ;
        for ( int j = 0 ;
        j < 9 ;
        j ++ ) {
          int repdigit = repdigitArray [ j ] ;
          int repdigitPattern = support * repdigit ;
          repdigitList . add ( repdigitPattern ) ;
        }
      }
      System . out . println ( repdigitList . get ( N - 1 ) ) ;
    }
    
public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; int N = scanner . nextInt ( ) ; int [ ] supportiveArray = { 1 , 11 , 111 , 1111 , 11111 , 111111 } ; int [ ] repdigitArray = { 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 } ; ArrayList < Integer > repdigitList = new ArrayList < Integer > ( ) ; for ( int i = 0 ; i < 6 ; i ++ ) { int support = supportiveArray [ i ] ; for ( int j = 0 ; j < 9 ; j ++ ) { int repdigit = repdigitArray [ j ] ; int repdigitPattern = support * repdigit ; repdigitList . add ( repdigitPattern ) ; } } System . out . println ( repdigitList . get ( N - 1 ) ) ; }
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