defmodule Main do
  def input, do: IO.read(:line) |> String.trim
  def ii, do: input() |> String.to_integer
  def li, do: input() |> String.split |> Enum.map(&String.to_integer/1)
  def yn(b), do: IO.puts (if b, do: "Yes", else: "No")

  def main do
    a = ii()

    t = div(a * 60, 100) + 10 * 60
    h = div(t, 60)
    m = rem(t, 60)
    :io.format("~B:~2..0B~n", [h, m])
  end
end