from collections import deque

h, w = map(int, input().split())
a = [list(input()) for _ in range(h)]
# どのように行っても最短路
dij = [(1, 0), (0, 1)]

ans = 0
stack = [(1, 0, 0)]
while stack:
    t, i, j = stack.pop()
    for di, dj in dij:
        ni = i+di
        nj = j+dj
        nt = t
        if not(0<=ni<h and 0<=nj<w and a[ni][nj] != "#"):
            continue

        if a[ni][nj] == "o":
            nt += 1
        else:
            nt -= 1
        if nt < 0:
            continue

        if ni == h-1 and nj == w-1:
            ans += 1
        else:
            stack.append((nt, ni, nj))
print(ans)