import sys
input = sys.stdin.readline
sys.setrecursionlimit(10**8)

from itertools import permutations

H, W = map(int, input().split())
A = [list(input()[:-1]) for _ in range(H)]

ans = 0

for E in set(permutations([0] * (H - 1) + [1] * (W - 1))):
    cnt = 1
    y, x = 0, 0
    flag = True
    for e in E:
        if e == 0:
            y += 1
        else:
            x += 1
        if A[y][x] == "o":
            cnt += 1
        if A[y][x] == "x":
            cnt -= 1
            if cnt < 0:
                flag = False
                break
        if A[y][x] == "#":
            flag = False
            break
        
    if not flag: continue
    ans += 1

print(ans)