/**
 *  author:   TakeruOkuyama
 *  created:  2020-04-09 14:53:46
**/
#include <bits/stdc++.h>
#define rep(i, n) for(int i = 0; i < (n); i++)
using namespace std;
using ll = long long;
using P = pair<int, int>;

int main(){
    int N, M;
    cin >> N >> M;
    int count = 0;
    rep(i, N*M){
        char color;
        cin >> color;
        if(color == 'W'){
            count++;
        }
    }
    cout << count << endl;
return 0;}

/**
**/