1 #include <stdio.h>
 2 #include <stdlib.h>
 3 int D,SIGN,Len_X,Len_Y;
 4 char Map[100][100];
 5 int Sign[100][100];
 6 
 7 int Sign_Part(int x,int y)
 8 {
 9 
10     int ii,jj;
11     if(x>=Len_X||x<0||y>=Len_Y||y<0)return 0;
12     if(Map[x][y]==‘#‘)return 0;
13     else Map[x][y]=‘#‘;
14     /*putchar(‘\n‘);
15        for(ii=0;ii<Len_X;ii++)
16         {
17             for(jj=0;jj<Len_Y;jj++)
18                 printf("%c",Map[ii][jj]);
19             putchar(‘\n‘);
20         }*/
21     Sign[x][y]=1;
22     SIGN++;
23     if(Map[x+1][y]!=‘#‘&&x+1<Len_X&&Sign[x+1][y]!=1)
24     {
25         Sign_Part(x+1,y);
26         Map[x+1][y]=‘.‘;
27     }
28     if(Map[x-1][y]!=‘#‘&&x-1>=0&&Sign[x-1][y]!=1)
29     {
30         Sign_Part(x-1,y);
31         Map[x-1][y]=‘.‘;
32     }
33     if(Map[x][y+1]!=‘#‘&&y+1<Len_Y&&Sign[x][y+1]!=1)
34     {
35         Sign_Part(x,y+1);
36         Map[x][y+1]=‘.‘;
37     }
38     if(Map[x][y-1]!=‘#‘&&y-1>=0&&Sign[x][y-1]!=1)
39     {
40         Sign_Part(x,y-1);
41         Map[x][y-1]=‘.‘;
42     }
43     return 0;
44 
45 }
46 
47 int main()
48 {
49     int i,j,Begin_x,Begin_y;
50     while(scanf("%d%d",&Len_Y,&Len_X)!=EOF)
51     {
52         if(Len_X==0&&Len_Y==0)break;
53         for(i=0;i<Len_X;i++)
54         {
55             getchar();
56             for(j=0;j<Len_Y;j++)
57             {
58                 scanf("%c",&Map[i][j]);
59                 if(Map[i][j]==‘@‘)
60                 {Begin_x=i;Begin_y=j;}
61             }
62         }
63         SIGN=0;
64         memset(Sign,0,sizeof(Sign));
65         Sign_Part(Begin_x,Begin_y);
66         printf("%d\n",SIGN);
67 
68     }
69 
70     return 0;
71 }