defmodule Main do
  def main do
    [n, m] = IO.gets("") |> String.trim |> String.split |> Enum.map(&String.to_integer/1)
    a = for _ <- 1..n, do: IO.gets("") |> String.trim

    ans =
      a
      |> Enum.flat_map(&String.graphemes/1)
      |> Enum.map(&(
          case &1 do
            "W" -> 1
            _ -> 0
          end
        ))
      |> Enum.sum

    IO.puts ans
  end
end