public static void main ( String [ ] args ) throws IOException {
  BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  String [ ] abc = br . readLine ( ) . split ( " " ) ;
  int a = Integer . parseInt ( abc [ 0 ] ) ;
  int b = Integer . parseInt ( abc [ 1 ] ) ;
  int c = Integer . parseInt ( abc [ 2 ] ) ;
  List < Integer > ans = new ArrayList < Integer > ( Arrays . asList ( a , b , c ) ) ;
  Collections . sort ( ans ) ;
  int i = ans . get ( 2 ) * 10 + ans . get ( 1 ) ;
  System . out . println ( i + ans . get ( 0 ) ) ;
}

public static void main ( String [ ] args ) throws IOException { BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ; String [ ] abc = br . readLine ( ) . split ( " ▁ " ) ; int a = Integer . parseInt ( abc [ 0 ] ) ; int b = Integer . parseInt ( abc [ 1 ] ) ; int c = Integer . parseInt ( abc [ 2 ] ) ; List < Integer > ans = new ArrayList < Integer > ( Arrays . asList ( a , b , c ) ) ; Collections . sort ( ans ) ; int i = ans . get ( 2 ) * 10 + ans . get ( 1 ) ; System . out . println ( i + ans . get ( 0 ) ) ; }
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