defmodule Main do
  defp f(c) do
    case c do
      "W" -> 1
       _ -> 0
    end
  end

  defp count(s), do: String.graphemes(s) |> Enum.map(&f/1) |> Enum.sum

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

    ans = Enum.map(a, &count/1) |> Enum.sum
    IO.puts ans
  end
end