defmodule Main do 
  def main do
    IO.gets("") |> String.trim |> String.to_integer |> matching |> IO.puts
  end
  
  def matching(n) when rem(n, 2) == 0 do
    String.duplicate("1", div(n,2))
  end
  
  def matching(n) do
    "7" <> String.duplicate("1", div(n-3, 2))
  end
end