1 #include <iostream>
 2 #include <cstdio>
 3 using namespace std;
 4 char a[21][21];
 5 int m,n;
 6 int count=0;
 7 void dfs(int x,int y)
 8 {
 9     if(a[x][y]==‘.‘&&x<n&&x>=0&&y<m&&y>=0)
10     {
11         count++;
12         a[x][y]=‘#‘;
13         dfs(x+1,y);
14         dfs(x,y+1);
15         dfs(x,y-1);
16         dfs(x-1,y);
17     }
18 }
19 int main()
20 {
21     freopen("in.txt","r",stdin);
22     while(scanf("%d%d",&m,&n)&&m!=0&&n!=0)
23     {
24         count=0;
25         int i,j,x,y;
26         for(i=0;i<n;i++)
27         {
28             for(j=0;j<m;j++)
29             {
30                 cin>>a[i][j];
31                 if(a[i][j]==‘@‘)
32                 {
33                     x=i;y=j;
34                 }
35             }
36         }
37         a[x][y]=‘.‘;
38         dfs(x,y);
39         cout<<count<<endl;
40     }
41 }