public static void main(String[] args) {

Scanner in = new Scanner(System.in);

while (true) {

int rows = in.nextInt();

int cols = in.nextInt();

if (rows == 0 && cols == 0) {

break;

}

char[][] arr = new char[rows][];

for (int i = 0; i < rows; i++) {

String str = in.next();

arr[i] = str.toCharArray();

}

int[][] flag = new int[rows][cols]; //记录是否已经走过

int res = helper(rows - 1, 0, rows, cols, arr, flag);

System.out.println(res);

}

}

private static int helper(int i, int j, int rows, int cols, char[][] arr, int[][] flag) {

if (i == rows - 1 && j == cols - 1) return 1;

if (i < 0 || i >= rows || j < 0 || j >= cols || arr[i][j] == '#' || flag[i][j] == 1) return 0;

flag[i][j] = 1;

return helper(i + 1, j, rows, cols, arr, flag) //右

+ helper(i, j + 1, rows, cols, arr, flag) //上

+ helper(i, j - 1, rows, cols, arr, flag) //下

+ helper(i - 1, j, rows, cols, arr, flag) //左

;

}