package main

import (
	"fmt"
	"strings"
)

func main() {
	var n, m, cnt int
	var s string
	fmt.Scan(&n, &m)
	for i := 0; i < n; i++ {
		fmt.Scan(&s)
		cnt += strings.Count(s, "W")
	}
	fmt.Println(cnt)
}