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 JAVA):

Solution:
import java.util.*;

public class Main {

	public static void main (String[] args) {
		new Main().calc();
	}

	int[] moveX = {0,0,-1,1};
	int[] moveY = {-1,1,0,0};
	char[][] map;
	boolean[][] check;
	int ans = 0;
	int x, y;

	void calc () {
		Scanner sc = new Scanner(System.in);
		while (true) {
			x = sc.nextInt();
			y = sc.nextInt();

			if (x == 0) break;

			ans = 0;
			map = new char[y][x];
			check = new boolean[y][x];

			for (int i = 0; i < y; i++)
				map[i] = sc.next().toCharArray();

			main:
			for (int i = 0; i < y; i++) {
				for (int j = 0; j < x; j++) {
					if (map[i][j] == '@') {
						ans = 1;
						check[i][j] = true;
						dfs(i, j);
						break main;
					}
				}
			}
			System.out.println(ans);
		}
	}
	void dfs (int y, int x) {
		for (int i = 0; i < moveX.length; i++) {
			int nextX = x + moveX[i];
			int nextY = y + moveY[i];

			if (0 <= nextX && nextX < map[0].length &&
				0 <= nextY && nextY < map.length &&
				map[nextY][nextX] == '.' &&
				!check[nextY][nextX]) {

				ans++;
				check[nextY][nextX] = true;
				dfs(nextY,nextX);
			}
		}
	}
}