def rec(cy,cx,cc):
    if A[cy][cx] == "o":
        nc = cc + 1
    else:
        if cc == 0:
            return
        else:
            nc = cc - 1
    if cy == H-1 and cx == W-1:
        res[0] += 1
        return
        
    for i in range(2):
        ny,nx = cy +dy[i],cx+dx[i]
        if not (0 <= ny < H and 0 <= nx < W):
            continue
        if A[ny][nx] == "#":
            continue
        rec(ny,nx,nc)
        


H,W = map(int,input().split())
A = []
for _ in range(H):
    a = input()
    A.append(a)

dy = (0,1)
dx = (1,0)

res = [0]
rec(0,0,0)

print(res[0])