program main
  implicit none
  integer i, a1, a2, a3
  read(*, *) a1, a2, a3
  !read(*, *) (L(i), i = 1,N)
  if (a1 + a2 + a3 > 21) then
    write(*, *) 'bust'
  else
    write(*, *) 'win'
  end if
end program main