package main

import "fmt"

func main() {
	var n int
	var m int
	fmt.Scan(&n, &m)
	var ans int
	for i := 0; i < n; i++ {
		var s string
		fmt.Scan(&s)
		b := []byte(s)
		for j := 0; j < m; j++ {
			if b[j] == 'W' {
				ans++
			}
		}
	}
	fmt.Println(ans)
}