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 Scanner sc = new Scanner(System.in);
	static int W, H, res;
	static char [][]field;
	static int[]dx = {-1, 0, 1, 0}, dy = {0, 1, 0, -1};
	public static void main(String[] args) {
		while(read()){
			search_Start();
			System.out.println(res);
		}
	}
	static boolean read(){
		W = sc.nextInt(); H = sc.nextInt();
		if(W == 0 && H == 0)
			return false;
		
		field = new char[H][W];
		res = 0;
		
		String line;
		for(int i = 0; i < H; i++){
			line = sc.next();
			for(int j = 0; j < W; j++)
				field[i][j] = line.charAt(j);
		}
		return true;
	}
	static void search_Start(){
		/**
		 * ツづ慊つクツづ債スツタツーツトツ地ツ点ツづーツ探ツつキツ。
		 */
		for(int i = 0; i < H; i++){
			for(int j = 0; j < W; j++){
				/**
				 * ツ個ゥツづつつッツつスツづァツ探ツ催オツ開ツ始
				 */
				if(field[i][j] == '@')
					dfs(j, i);
			}
		}
	}
	static void dfs(int x, int y){
		field[y][x] = '#';
		res++;
		int mx = 0, my = 0;
		for(int i = 0; i < 4; i++){
			mx = x + dx[i]; my = y + dy[i];
			if( 0 <= mx && mx < W && 0 <= my && my < H && field[my][mx] == '.')
				dfs(mx, my);
		}
	}

}