program main
  implicit none
  character*12::S
  integer::i,lenk
  integer*8,allocatable::N(:)

  read *,S
  lenk = LEN_TRIM(S)
  if(lenk.lt.3) then
     print '("0")'
     return
  end if
  allocate(N(lenk))
  do i=1,lenk
     N(i) = ICHAR(S(i:i))-ICHAR('0')
  end do
  print '(i0)', partmax(N)
contains
  recursive function partmax(N) result(pmax)
    integer*8,intent(in) ::N(:)
    integer*8,allocatable::M(:)
    integer*8::cww,pmax,i,j,k,l,len
    pmax = 0
    len = size(N)
    if(len .gt. 5) then
       do i=1,len-2
          if(N(i).eq.0) cycle
          do j=i+1,len-1
             if(N(i).eq.N(j)) cycle
             do k=j+1, len
                if(N(j).ne.N(k)) cycle
                M = pack(N, (/(l.ne.i.and.l.ne.j.and.l.ne.k,l=1,len)/))
                cww = (N(i)*10+N(j))*10+N(k)
                pmax = MAX(cww+partmax(M),pmax)
             end do
          end do
       end do
    else
       do i=1,len-2
          if(N(i).eq.0) cycle
          do j=i+1,len-1
             if(N(i).eq.N(j)) cycle
             do k=j+1, len
                if(N(j).ne.N(k)) cycle
                cww = (N(i)*10+N(j))*10+N(k)
                pmax = MAX(cww,pmax)
             end do
          end do
       end do
    endif
  end function partmax
end program main