#include<iostream>
#include<algorithm>
#include<vector>
#include<cmath>
using namespace std;
int main(){
	int x,y,ans=0;
	char ch;
	cin >> x >> y;
	for(int i=0;i<y;i++){
		for(int j=0;j<x;j++){
			cin >> ch;
			if(ch=='W')	ans++;
		}
	}
	cout << ans << endl;
	return 0;
}