#include <iostream>
#include <string>

int main(void){
	int N, M, count=0;
	std::cin >> N >> M ;
	std::string A;
	for (int i = 0; i < N; i++){
		std::cin >> A;
		for (int j = 0; j < M; j++){
			if(A[j]=='W')count++;
		}
	}
	std::cout << count;
	return 0;
}