#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); ++i)
int main(void)
{
  int n, m;
  cin >> n >> m;
  vector<string> a(n);
  rep(i, n) cin >> a[i];

  int ans = 0;
  rep(i, n) rep(j, m) if (a[i][j] == 'W') ans++;

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