package algo;

import java.util.ArrayList;
import java.util.Scanner;

import java.util.*;

public class sample7 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int M = sc.nextInt();
		int cnt = 0;
		for(int i=0; i < N; i++) {
			String str = sc.next();
			char[] c = str.toCharArray();
			for(char cc : c) {
				if(cc == 'W') {
					cnt++;
				}
			}
		}
		System.out.println(cnt);
	}
}