#include
    
     #include
     
      char str[22][22];int temp[22][22];int cnt,h,w;void dfs(int x,int y){    cnt ++;    temp[x][y] = 1;    if(!temp[x+1][y]&& x+1 < w)        dfs(x+1,y);    if(!temp[x-1][y] && x-1 > -1)        dfs(x-1,y);    if(!temp[x][y+1] && y+1 < h)        dfs(x,y+1);    if(!temp[x][y-1] && y-1 > -1)        dfs(x,y-1);}int main(){    int i,j,a,b;    while(~scanf("%d%d",&h,&w)&&h+w)    {        cnt = 0;        for(i = 0;i < w;i ++)        {            scanf("%s",str[i]);            for(j = 0;j < h;j ++)            {                if(str[i][j] == '#')                    temp[i][j] = 1;                if(str[i][j] == '.')                    temp[i][j] = 0;                if(str[i][j] == '@')                {                    a = i;                    b = j;                }            }        }        dfs(a,b);        printf("%d\n",cnt);    }    return 0;}