import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int h = sc.nextInt();
        int w = sc.nextInt();
        int count = 0;
        for (int i = 0; i < h; i++) {
            for (char c : sc.next().toCharArray()) {
                if (c == 'W') {
                    count++;
                }
            }
        }
        System.out.println(count);
    }
}