import java.util.Scanner;

public class Main {

	static Scanner sc = new Scanner(System.in);

	public static void main(String[] args) {

		int n = sc.nextInt();
		int m = sc.nextInt();
		
		int ans = 0;
		for(int i = 0; i < n; i++) {
			String s = sc.next();
			for(int j = 0; j < m; j++) {
				if(s.charAt(j) == 'W') ans++;
			}
		}
		
		System.out.println(ans);
    }
}