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

#ifdef DEBUG_
#include <compe/debug.hpp>
#else
#define dump(...)
#endif

// clang-format off
struct  Fast{Fast(){std::cin.tie(0);ios::sync_with_stdio(false);}} fast;

#define rep(i,n) for (int i=0; i<(int)n; ++i)
#define rrep(i,a,n) for (int i=a; i<(int)n; ++i)
#define out(msg) cout << (msg) << '\n'
#define die(msg) do{ cout << (msg) << endl,exit(0); }while(0)
#define el '\n'

#define all(k)  k.begin(),  k.end()
#define rall(k) k.rbegin(), k.rend()

// const
#define INFi  1   << 30
#define INFll 1LL << 60
#define MOD17 10'0000'0007
#define MOD98  9'9824'4353

// alias
using ullint = unsigned long long int;
using llint  = long long int;

template <typename T> inline bool chmax(T& a, const T& b) {
  return ((a < b) ? (a = b, true) : false);
}
template <typename T> inline bool chmin(T& a, const T& b) {
  return ((a > b) ? (a = b, true) : false);
}
// clang-format on

int main() {
  int h, w;
  cin >> h >> w;

  vector<string> grid(h);
  rep(i, h) cin >> grid[i];

  auto dfs = [&](auto f, int y, int x, int jewel) -> int {
    // outbound
    if (!(0 <= y && y < h && 0 <= x && x < w)) return 0;

    if (grid[y][x] == 'o') {
      jewel++;
    } else if (grid[y][x] == 'x') {
      if (jewel == 0) return 0;
      jewel--;
    } else {
      return 0;  // can't pass
    }

    // goal
    if (y == h - 1 && x == w - 1) {
      if (jewel >= 0)
        return 1;
      else
        return 0;
    }

    int cnt{};
    if (y < h) cnt += f(f, y + 1, x, jewel);
    if (x < w) cnt += f(f, y, x + 1, jewel);
    return cnt;
  };

  int cnt = dfs(dfs, 0, 0, 0);
  cout << cnt << el;
}