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:
count = 0
role = {".": True, "@": False, "#": False}
def now(xpoint, ypoint):
    return role[room[ypoint][xpoint]]

def search(xpoint, ypoint):
    global count
    if 0 <= xpoint < wh[0] and 0 <= ypoint < wh[1] and now(xpoint, ypoint):
        count += 1
        room[ypoint][xpoint] = "@"
        search(xpoint - 1, ypoint)
        search(xpoint + 1, ypoint)
        search(xpoint, ypoint + 1)
        search(xpoint, ypoint - 1)

while True:
    wh = map(int, raw_input().split())
    room = []
    count = 0
    for ypoint in range(wh[1]):
        line = raw_input().replace("\n", "")
        if "@" in line:
            xp = line.index("@")
            yp = ypoint
        room.append([x for x in line])
    if not room: break
    room[yp][xp] = "."
    search(xp, yp)
    print count