defmodule Main do
    def main do
        [a, b, c, d] = IO.gets("") |> String.trim |> String.split |> Enum.map(&String.to_integer/1)
        e = div(b, c)
        f = div(d, (c + 1))
        n = Enum.min([a, e, f])
        IO.puts n
    end
end