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.Scanner;


public class Main {
	
	int w, h;
	char[][] map;
	
	int count;
	
	void dfs(int x, int y) {
		int[] dx = new int[]{0, 0, -1, 1};
		int[] dy = new int[]{1, -1, 0, 0};
		for (int i = 0; i < 4; i++) {
			int nx = x + dx[i];
			int ny = y + dy[i];
			if (0 <= nx && nx < w && 0 <= ny && ny < h && map[ny][nx] == '.') {
				map[ny][nx] = '#';
				count++;
				dfs(nx, ny);
			}
		}
	}
	
	int solve() {
		count = 1;
		for (int y = 0; y < h; y++) {
			for (int x = 0; x < w; x++) {
				if (map[y][x] == '@') {
					dfs(x, y);
				}
			}
		}
		return count;
	}
	
	void run() {
		Scanner sc = new Scanner(System.in);
		String output = "";
		while (sc.hasNext()) {
			w = sc.nextInt();
			h = sc.nextInt();
			if (w == 0 && h == 0) {
				break;
			} else {
				sc.skip("\n");
				map = new char[h][];
				for (int i = 0; i < h; i++) {
					String row = sc.nextLine();
					map[i] = row.toCharArray();
				}
				output += solve() + "\n";
			}
		}
		sc.close();
		System.out.print(output);
	}

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

}