(define (count-W-in-string s)
  (define (rec idx count)
    (if (= idx (string-length s))
      count
      (rec
        (+ idx 1)
        (if (char=? (string-ref s idx) #\W) (+ count 1) count))))
  (rec 0 0))

(define yuki712
  (let*
    (
      (n (read))
      (m (read))
      (_ (read-line))
      (s "")
    )
    (do
      ((i 0 (+ i 1)))
      ((= i n))
      (set! s (string-append s (read-line)))
    )
    (write (count-W-in-string s))
    (newline)))