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 CPP):

Solution:
//Red and Black
#include<bits/stdc++.h>
using namespace std;

#define rep(i,n) for(int i=0; i<n; i++)

int W, H;
vector<string> mp;
int dir[4][2]={{0,1},{1,0},{0,-1},{-1,0}};

void solve(int x, int y){
  if(x<0 || H<=x || y<0 || W<=y || mp[x][y]!='.')return;
  mp[x][y]='A';
  rep(i,4)solve(x+dir[i][0], y+dir[i][1]);
}

int main(){
  while(true){
    cin>>W>>H;
    if(W==0&&H==0)break;
    mp.clear();
    rep(i,H){
      string s;
      cin>>s;
      mp.push_back(s);
    }
    int sx, sy;
    rep(i,H)rep(j,W)if(mp[i][j]=='@'){sx=i; sy=j; break;}
    mp[sx][sy]='.';
    solve(sx, sy);

    int cnt=0;
    rep(i,H)rep(j,W)if(mp[i][j]=='A')cnt++;
    cout<<cnt<<endl;
  }
  return 0;
}