import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int N = scan.nextInt();
		int M = scan.nextInt();
		int cnt = 0;
		for(int i = 0; i < N; i++) {
			String s = scan.next();
			for(int j = 0; j < M; j++) {
				char c = s.charAt(j);
				if(c == 'W') {
					cnt ++;
				}
			}
		}
		scan.close();
		System.out.println(cnt);
	}
}