defmodule Main do
  def main do
    [n, m] = IO.gets("") |> String.trim |> String.split |> Enum.map(&String.to_integer/1)
    ans = for _ <- 1..n do
      IO.gets("")
      |> String.slice(0..m-1)
      |> String.to_charlist
      |> Enum.count(&(&1 === ?W))
    end
    |> Enum.sum
    IO.puts ans
  end
end