from collections import deque

h, w = map(int, input().split())
A = [list(input()) for _ in range(h)]

D = [(1, 0), (0, 1)]
Que = deque([(1, 0, 0)])
ans = 0
while Que:
    cc, ci, cj = Que.popleft()
    if ci == h - 1 and cj == w - 1:
        ans += 1
        continue
    for di, dj in D:
        ni, nj = ci + di, cj + dj
        if 0 <= ni < h and 0 <= nj < w:
            if A[ni][nj] == '#':
                continue
            if A[ni][nj] == 'o':
                nc = cc + 1
            else:
                nc = cc - 1
                if nc == -1:
                    continue
            Que.append((nc, ni, nj))
print(ans)