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:
import copy
w, h = map(int,input().split())
while [h, w] != [0, 0]:
    area = []
    a = 1
    for i in range(h):
        area.append(list(input()))
        area[i].insert(0,"#")
        area[i].append("#")
    area.insert(0,["#" for i in range(w + 2)])
    area.append(["#" for i in range(w + 2)])

    que = []
    for i in range(1, h + 1):
        for j in range(1, w + 1):
            if area[i][j] == "@":
                que.append([i, j])
                break
        else:
            continue
        break
    while True:
        nque = []
        for i in que:
            h1 = i[0]
            w1 = i[1]
            if area[h1 - 1][w1] == ".":
                area[h1 - 1][w1] = "*"
                nque.append([h1 - 1, w1])
                a += 1
            if area[h1 + 1][w1] == ".":
                area[h1 + 1][w1] = "*"
                nque.append([h1 + 1, w1])
                a += 1
            if area[h1][w1 - 1] == ".":
                area[h1][w1 - 1] = "*"
                nque.append([h1, w1 - 1])
                a += 1
            if area[h1][w1 + 1] == ".":
                area[h1][w1 + 1] = "*"
                nque.append([h1, w1 + 1])
                a += 1
        if nque == []:
            break
        que = copy.deepcopy(nque)

    print(a)
        
    w, h = map(int,input().split())