import java.util.Scanner;

public class No_712 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		final int N = sc.nextInt();
		final int Y = sc.nextInt();
		int count = 0;
		for(int i = 0 ; i < N ; i++) {
			String[] s = sc.next().split("");
			for(String ss :s) {
				if("W".equals(ss))
					count++;
			}
		}
		System.out.println(count);
	}
}