using System.Collections.Generic;
using System;

class Perm
{
    public static void Swap<T>(ref T x, ref T y) { T tmp = x; x = y; y = tmp; }

    public static bool NextPermutation<T>(T[] array, int index, int length, Comparison<T> comp)
    {
        if (length <= 1) return false;
        for (int i = length - 1; i > 0; i--)
        {
            int k = i - 1;
            if (comp(array[k], array[i]) < 0)
            {
                int j = Array.FindLastIndex(array, delegate (T x) { return comp(array[k], x) < 0; });
                Swap(ref array[k], ref array[j]);
                Array.Reverse(array, i, length - i);
                return true;
            }
        }
        Array.Reverse(array, index, length);
        return false;
    }

    public static bool NextPermutation<T>(T[] array) where T : IComparable
    {
        return NextPermutation(array, 0, array.Length, Comparer<T>.Default.Compare);
    }
}

public class hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var h = int.Parse(line[0]);
        var w = int.Parse(line[1]);
        var map = new char[h, w];
        for (int i = 0; i < h; i++)
        {
            var s = Console.ReadLine().Trim();
            for (int j = 0; j < w; j++) map[i, j] = s[j];
        }
        getAns(h, w, map);
    }
    static bool check(char[,] map, int[] a)
    {
        var x = 0;
        var y = 0;
        var jw = 1;
        foreach (var z in a)
        {
            if (z == 0) x++;
            else y++;
            if (map[x, y] == 'o') jw++;
            else if (map[x, y] == 'x')
            {
                jw--;
                if (jw < 0) return false;
            }
            else return false;
        }
        return true;
    }
    static void getAns(int h, int w, char[,] map)
    {
        var a = new int[h + w - 2];
        var c = 0;
        for (int i = h - 1; i < h + w - 2; i++) a[i] = 1;
        do
        {
            if (check(map, a)) c++;
        }
        while (Perm.NextPermutation(a));
        Console.WriteLine(c);
    }
}