(let* ((l1 (map string->number (string-split (read-line) " ")))
       (y (car l1))
       (result (let loop ((i 0)
                          (a 0))
                         (if (= i y)
                             a
                             (loop (+ i 1) 
                                   (+ a (let loop2 ((l (string->list (read-line)))
                                                    (a 0))
                                                   (if (null? l)
                                                       a
                                                       (loop2 (cdr l)
                                                              (if (eq? #\W (car l))
                                                                  (+ a 1)
                                                                  a))))))))))
      (print result))