Problem: There is a rectangular room, covered with square tiles. Each tile is colored either red or black. A man is standing on a black tile. From a tile, he can move to one of four adjacent tiles. But he can't move on red tiles, he can move only on black tiles.

Write a program to count the number of black tiles which he can reach by repeating the moves described above.



Input

The input consists of multiple data sets. A data set starts with a line containing two positive integers W and H; W and H are the numbers of tiles in the x- and y- directions, respectively. W and H are not more than 20.

There are H more lines in the data set, each of which includes W characters. Each character represents the color of a tile as follows.

* '.' - a black tile
* '#' - a red tile
* '@' - a man on a black tile(appears exactly once in a data set)


The end of the input is indicated by a line consisting of two zeros.

Output

For each data set, your program should output a line which contains the number of tiles he can reach from the initial tile (including itself).

Examples

Input

6 9
....#.
.....#
......
......
......
......
......
#@...#
.#..#.
11 9
.#.........
.#.#######.
.#.#.....#.
.#.#.###.#.
.#.#..@#.#.
.#.#####.#.
.#.......#.
.#########.
...........
11 6
..#..#..#..
..#..#..#..
..#..#..###
..#..#..#@.
..#..#..#..
..#..#..#..
7 7
..#.#..
..#.#..
###.###
...@...
###.###
..#.#..
..#.#..
0 0


Output

45
59
6
13


Input

6 9
....#.
.....#
......
......
......
......
......
@...#
.#..#.
11 9
.#.........
.#.#######.
.#.#.....#.
.#.#.###.#.
.#.#..@#.#.
.#.#####.#.
.#.......#.
.#########.
...........
11 6
..#..#..#..
..#..#..#..
..#..#..###
..#..#..#@.
..#..#..#..
..#..#..#..
7 7
..#.#..
..#.#..
.###
...@...
.###
..#.#..
..#.#..
0 0


Output

45
59
6
13

Solution (in PYTHON3):

Solution:
def count_area(h,w):
	count = 0
	if (h>0) and (s[h-1][w]== "."):
		s[h-1][w] = "#"
		count += count_area(h-1,w)
	if (h<H-1) and (s[h+1][w]== "."):
		s[h+1][w] = "#"
		count += count_area(h+1,w)
	if (w>0) and (s[h][w-1]== "."):
		s[h][w-1] = "#"
		count += count_area(h,w-1)
	if (w<W-1) and (s[h][w+1]== "."):
		s[h][w+1] = "#"
		count += count_area(h,w+1)
	return count+1

while(True):
	W, H = map(int, input().split())
	if H==0&W==0:break

	s = [list(input()) for i in range(H)]
	
	for h in range(H):
		for w in range(W):
			if s[h][w] == "@":
				s[h][w] = "#"
				print(count_area(h,w))
				break