#include <fstream>
#include <iostream>
#include <string>

int main() {

	//std::ifstream inf("Text.txt");	std::cin.rdbuf(inf.rdbuf());

	int N, M, ans = 0;
	std::cin >> N >> M;
	std::string S;

	for (int i = 0; i < N; i++) {
		std::cin >> S;
		for (int j = 0; j < M; j++) {
			if (S[j] == 'W') {
				ans++;
			}
		}
	}

	std::cout << ans << std::endl;

	return 0;
}