package net.ipipip0129.yukicoder.No712;

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int height = scan.nextInt();
        int width = scan.nextInt();

        int ans_cnt = 0;

        scan.nextLine();

        for (int i = 0; i < height; i++) {
            String line = scan.nextLine();
            for (char s : line.toCharArray()) {
                if (s == 'W') ans_cnt += 1;
            }
        }

        System.out.println(ans_cnt);
    }
}