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 PYTHON):

Solution:
def solve(dat):
    H = len(dat)
    W = len(dat[0])

    for i in range(H):
        for j in range(W):
            if dat[i][j] == "@":
                si, sj = i, j

    tmp = [[0 for _ in range(W)] for _ in range(H)]
    di = [-1,1,0,0]
    dj = [0,0,-1,1]
    pool = [(si, sj)]

    while len(pool) > 0:
        # print pool, i, j
        i, j = pool.pop()
        tmp[i][j] = 1
        for k in range(4):
            ni = i + di[k]
            nj = j + dj[k]
            if ni in range(H) and nj in range(W) and dat[ni][nj] == "." and tmp[ni][nj] == 0:
                pool.append((ni, nj))
    cnt = sum([sum(tmp[i]) for i in range(H)])
    return cnt


while True:
    W, H = map(int, raw_input().split(" "))
    if W == H == 0:
        break
    dat = [raw_input() for _ in range(H)]
    print solve(dat)