#include <bits/stdc++.h>
using namespace std;

int main() {
  int H, W, C = 0; cin >> H >> W;
  vector<string> S(H); for (string &T : S) cin >> T;

  auto BFS = [&](auto BFS, int Y, int X, int J) {
    J += S.at(Y).at(X) == 'o' ? 1 : -1;
    if (J == -1) return;
    if (Y == H - 1 && X == W - 1) {
      C += J != -1 ? 1 : 0;
      return;
    }
    if (Y + 1 != H && S.at(Y + 1).at(X) != '#') BFS(BFS, Y + 1, X, J);
    if (X + 1 != W && S.at(Y).at(X + 1) != '#') BFS(BFS, Y, X + 1, J);
  };

  BFS(BFS, 0, 0, 0);
  cout << C << endl;
}