1 #include<cstdio>
2 #include<iostream>
3 #include<cstring>
4
5 using namespace std;
6
7 int dir[4][2] = {{-1, 0}, {1, 0}, {0, -1}, {0, 1}};
8
9 int n, m, ans;
10 bool flag[25][25];
11 char g[25][25];
12
13 inline void dfs(int x, int y){
14 for(int i = 0; i < 4; i++){
15 int nx = x + dir[i][0];
16 int ny = y + dir[i][1];
17 if(nx <= m && ny <= n && nx > 0 && ny > 0 && !flag[nx][ny] && g[nx][ny] == '.'){
18 ans++;
19 flag[nx][ny] = 1;
20 dfs(nx, ny);
21 }
22 }
23 }
24
25 int main(){
26 while(~scanf("%d%d", &n, &m) && n != 0 && m != 0){
27 int x, y;
28 memset(flag, 0, sizeof(flag));
29 for(int i = 1; i <= m; i++){
30 for(int j = 1; j <= n; j++){
31 cin >> g[i][j];
32 if(g[i][j] == '@'){ x = i; y = j;}
33 }
34 }
35 ans = 0;
36 flag[x][y] = 1;
37 dfs(x, y);
38 printf("%d
", ans + 1);
39 }
40 return 0;
41 }
42
