#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
int main(){
int a,b,ans=0;
char aa[50][50];
cin>>a>>b;
for(int i=0;i<b;i++){
	for(int j=0;j<a;j++){
		cin>>aa[i][j];
		if(aa[i][j]=='W'){
			ans++;
		}
	}
}
cout<<ans<<endl;
}