#include <iostream>
#include <string>
using namespace std;
int main(int argc, char* argv[])
{
	int N,M;
	cin>>N>>M;
	string S;
	int i;
	int num=0;
	for (i=0;i<N;i++){
		cin>>S;
		for (int j=0;j<S.length();j++){
			if (S[j]=='W'){
				num++;
			}
		}
	}
	cout<<num<<endl;
	return 0;
}