defmodule Main do
  def main do
    [a, b, c] =
      IO.read(:line)
      |> String.trim
      |> String.split(" ")
    a = String.to_integer(a)
    b = String.to_integer(b)
    c = String.to_integer(c)
    if a + b + c <= 21 do 
    IO.puts("win")
    else 
    IO.puts("bust") 
    end
  end
end
