#include<iostream>
#include<vector>
#include<algorithm>
#include<functional>
#include<queue>
#include<stack>
#include<set>
#include<climits>
#include<cstdlib>
#include<cmath>
#include<string>

using namespace std;

#define INF 1 << 29
#define LL long long int

LL const MOD = 1000000007;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    LL n,m;
	cin >> n >> m;

	vector<string> str(n);

	for(int i = 0; i < n; i++){
		cin >> str[i];
	}

	LL ans = 0;
	for(int i = 0; i < n; i++){
		for(int j = 0; j < str[i].size(); j++){
			if(str[i][j] == 'W'){
				ans++;
			}
		}
	}

	cout << ans << endl;
    
    return 0;
}