#include<stdio.h>

int W, H;
int count;
int vis[30][30];
char str[30][30];

struct Point{
    int x, y;
}Start;

int dx[]={-1,0,1,0}, dy[]={0,1,0,-1};

void Scan_Point();//输入函数
void DFS(struct Point p);//执行函数

int main()
{
    while(scanf("%d%d",&H,&W)){
        if(W==0 && H==0) break;
        count=1;
        Scan_Point();
        DFS(Start);
        printf("%d\n",count);
    }
    return 0;
}

void Scan_Point(){
    int i, j;
    getchar();
    for(i=0; i<W; i++){
        for(j=0; j<H; j++){
            scanf("%c",&str[i][j]);
            vis[i][j]=1;
            if(str[i][j]=='@'){
                Start.x=i;
                Start.y=j;
            }
        }
        getchar();
    }
}

void DFS(struct Point p){
    int a, b;
    int i, j;
    struct Point temp;
    for(i=0; i<4; i++){
        a=p.x+dx[i]; b=p.y+dy[i];
        temp.x=a; temp.y=b;
        if(a>=0 && a<W && b>=0 && b<H && str[a][b]=='.' && vis[a][b]){
            count++;
            vis[a][b]=0;
            DFS(temp);
        }
    }
    return ;
}
/**************************************************************
	Problem: 2126
	User: admin
	Language: C
	Result: Accepted
	Time:12 ms
	Memory:1148 kb
****************************************************************/