defmodule Main do
  def main do
    IO.read(:line)
    |> String.trim()
    |> String.split()
    |> Enum.map(&String.to_integer/1)
    |> solve
    |> IO.puts()
  end

  def solve([a, b]) do
    cond do
      a < 23 ->
        cond do
          b < 23 -> 3
          b == 23 -> 2
          b == 24 -> 1
          true -> 0
        end

      a > 25 ->
        3

      true ->
        3 - (([b, 25] |> Enum.min()) - a + 1)
    end
  end
end