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.*;
import java.awt.Point;

public class Main {
	static int w,h,sx,sy;
	static int[] dx = {-1, 0, 1, 0}, dy = {0, -1, 0, 1};
	static String[] field;
	static boolean[][] visited;
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		while(read()) {
			System.out.println(solve());
		}
	}
	
	static boolean read() {
		w = sc.nextInt(); h = sc.nextInt();
		if(w == 0 && h == 0) {
			return false;
		}
		field = new String[h];
		
		for(int i = 0; i < h; i++) {
			field[i] = sc.next();
			int tmp = field[i].indexOf('@');
			if(tmp != -1) {
				sy = i; sx = tmp;
			}
		}
		return true;
	}
	
	static int solve() {
		visited = new boolean[h][w];
		Queue<Point> que = new LinkedList<Point>();
		Point s = new Point(sx, sy);
		
		que.add(s);
		visited[sy][sx] = true;
		int ans = 1;
		while(!que.isEmpty()) {
			Point p = que.poll();
			for(int i = 0; i < 4; i++) {
				Point next = new Point(p.x + dx[i], p.y + dy[i]);
				if(!inField(next) || field[next.y].charAt(next.x) == '#' || visited[next.y][next.x] == true) {
					continue;
				} else {
					que.add(next);
					visited[next.y][next.x] = true;
					ans++;
				}
			}
		}
		return ans;
	}
	
	static boolean inField(Point p) {
		if(p.x >= 0 && p.x < w && p.y >= 0 && p.y < h) {
			return true;
		} else {
			return false;
		}
	}
}