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:
"""
1. スタート地点の座標を取得
2. スタート地点からbfsをして到達可能な”.”の数を数える
"""

from collections import deque

def bfs(h, w, f, s):
    count = 1
    q = deque()
    q.append(s)

    move = ((0, 1), (0, -1), (1, 0), (-1, 0))

    while q:
        i, j = q.popleft()

        for di, dj in move:
            ni , nj = i + di, j + dj
            if 0 <= ni < w and 0 <= nj < h and f[ni][nj] == ".":
                count += 1
                q.append((ni, nj))
                f[ni][nj] = "#"

    return count

def search_atmark(h, w, f):
    for i in range(h):
        for j in range(w):
            if f[i][j] == "@":
                return (i, j)

def solve(h, w, f):
    s = search_atmark(w, h, f)
    return bfs(h, w, f, s)

if __name__ == '__main__':
    while(True):
        w, h = map(int, input().split())
        if w == 0 and h == 0:
            break

        f = [list(input()) for i in range(h)]
        print(solve(w, h, f))