import java.util.*;

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