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, b, c, d] = li()

    case {a, b} do
      {0, b} -> div(d, b)
      {a, 0} -> div(c, a)
      {a, b} -> min(div(c, a), div(d, b))
    end
    |> IO.puts
  end
end