#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <complex>
#include <stack>
#include <queue>
#include <unordered_map>
#include <utility>
using namespace std;

int main(){
    int n, m;
    int i;
    int count = 0;
    char s;
    cin >> n >> m;
    for(i = 0; i < n*(m+1); i++){
        scanf("%c", &s);
        if(s == 'W') count++;
    }
    cout << count << endl;
}