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 {
	static char[] l = new char[] {'q','w','e','r','t','a','s','d','f','g','z','x','c','v','b'};
	static String[][] map;
	static boolean[][] vmap;
	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		while(true) {
			int w = stdIn.nextInt();
			int h = stdIn.nextInt();
			if (h == 0 && w == 0) break;
			map = new String[h][w];
			vmap = new boolean[h][w];
			int x = 0;
			int y = 0;
			for(int i = 0; i < h; i++) {
				String a = stdIn.next();
				for(int j = 0; j < w; j++) {
					map[i][j] = String.valueOf(a.charAt(j));
					if(a.charAt(j) == '@') {
						x = j;
						y = i;
					}
				}
			}
			sorv(y,x);
			int ans = 0;
			for(int i = 0; i < h; i++) {
				for(int j = 0; j < w; j++) {
					if(vmap[i][j]) ans++;
				}
			}
			System.out.println(ans);
		}
	}
	public static void sorv(int y,int x) {
		if(y < 0 || x < 0) return;
		if(y >= map.length || x >= map[y].length) return;
		if(map[y][x].equals("#")) return;
		if(vmap[y][x]) return;
		vmap[y][x] = true;
		sorv(y+1,x);
		sorv(y-1,x);
		sorv(y,x+1);
		sorv(y,x-1);
		
	}
}