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.awt.Point;
import java.util.ArrayList;
import java.util.Scanner;

public class Main {

	static Scanner sc = new Scanner(System.in);
	static int[] DR = { 1, 0, -1, 0 };
	static int[] DC = { 0, 1, 0, -1 };

	public static void main(String[] args) throws Exception {
		while (true) {
			int W = sc.nextInt();
			if (W == 0) break;
			int H = sc.nextInt();
			boolean[][] f = new boolean[H + 2][W + 2];
			ArrayList<Point> ps = new ArrayList<Point>();
			for (int i = 0; i < H; ++i) {
				char[] line = sc.next().toCharArray();
				for (int j = 0; j < W; ++j) {
					if (line[j] == '@') {
						ps.add(new Point(i + 1, j + 1));
					} else if (line[j] == '.') {
						f[i + 1][j + 1] = true;
					}
				}
			}
			int ans = 1;
			while (!ps.isEmpty()) {
				ArrayList<Point> next = new ArrayList<Point>();
				for (Point p : ps) {
					for (int i = 0; i < 4; ++i) {
						int nr = p.x + DR[i];
						int nc = p.y + DC[i];
						if (f[nr][nc]) {
							++ans;
							f[nr][nc] = false;
							next.add(new Point(nr, nc));
						}
					}
				}
				ps = next;
			}
			System.out.println(ans);
		}
	}
}