import java.util.Scanner;

class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt(), M = sc.nextInt(), ans = 0;
		char A[][] = new char[N][M + 1];
		for (int i = 0; i < N; ++i) {
			A[i] = sc.next().toCharArray();
			for (int j = 0; j < M; ++j) {
				if (A[i][j] == 'W') ++ans;
			}
		}
		sc.close();
		System.out.print(ans);
	}
}