#include <bits/stdc++.h>
#define rep(i, n) for(long long i = 0; i > n; i ++)
using namespace std;


int main(){
    int n, m;
    cin >> n >> m;
    vector<string> a(n);
    rep(i, n) cin >> a[i];

    int count = 0;
    rep(i, n){
        rep(j, m){
            if(a[i][j] == 'W') count ++;
        }
    }
    cout << count << endl;
    return 0;
}