#include <bits/stdc++.h>
#define LL long long
using namespace std;
const int N = 20 + 10;
const int INF = 0x3f3f3f3f;
char a [N] [N];
int m , n , k , q , w;
int xx [4] = {-1 , 1 , 0 , 0};
int yy [4] = {0 , 0 , 1 , -1};
bool f (int c , int d)
{
	if (a [c] [d] == '.' && c >= 1 && c <= n && d >= 1 && d <= m)
	{
		return 1;
	}
	return 0;
}
void dfs (int x , int y)
{
	/*if (a [x] [y] == "#")
	    return;*/
	a [x] [y] = '#';
	for (int i = 0; i < 4; i++)
	{
		int nx = x + xx [i];
		int ny = y + yy [i];
		if (f (nx , ny)) 
		{
			k++;
		    dfs (nx , ny);
		}
	}
}
int main()
{
	    while (cin >> m >> n)
	    {
	    	if (m == 0 && n == 0)
	    	{
	    		break;
			}
			for (int i = 1; i <= n; i++)
	        {
	    	    for (int j = 1; j <= m; j++)
			    {
				    cin >> a [i] [j];
				    if (a [i] [j] == '@')    
			        {
					    q = i;
				        w = j;
				    }
			    } 
		    }
		    k = 1;
            dfs (q , w);
		    cout << k << endl;
		}
	    return 0;
}

#include<iostream>
//#include<iomanip>
//#include<math.h>
using namespace std;

// var
int w,h,ax,ay,cnt = 1;
int dx[] = {0,-1,0,1};
int dy[] = {-1,0,1,0};
char a[55][55];

// func
bool check(int x,int y){
    return ( x <= h && x >= 1 && y <= w && y >= 1 && a[x][y] == '.' );
}

void dfs(int x,int y){
    // locked
    a[x][y] = '#';

    // diffusion
    for(int i=0;i<=3;i++){
        if(check(x + dx[i],y + dy[i])){
            cnt ++;
            dfs(x + dx[i],y + dy[i]);
        }
    }
}

int main(){
    // in 
    while(cin >> w >> h){
        // break_cond
        if(w == 0 && h == 0){
            break;
        }

        // input_array
        for(int i=1;i<=h;i++){
            for(int j=1;j<=w;j++){
                cin >> a[i][j];

                if(a[i][j] == '@') ax = i , ay = j; // ???
            }
        }

        // call_func
        dfs(ax,ay);

        // out
        cout << cnt << endl;
        cnt = 1;
    }
    return 0;
}

#include <bits/stdc++.h> using namespace std; const int N = 1e2 + 10; char a [N] [N]; int m , n , k , q , w; int xx [4] = {-1 , 1 , 0 , 0}; int yy [4] = {0 , 0 , 1 , -1}; bool f (int c , int d) { if (a [c] [d] == '.' && c >= 1 && c <= n && d >= 1 && d <= m) { return 1; } return 0; } void dfs (int x , int y) {

a [x] [y] = '#';
for (int i = 0; i < 4; i++)
{
	int nx = x + xx [i];
	int ny = y + yy [i];
	if (f (nx , ny)) 
	{
		k++;
	    dfs (nx , ny);
	}
}

} int main() { while (cin >> m >> n) { if (m == 0 && n == 0) { break; } for (int i = 1; i <= n; i++) { for (int j = 1; j <= m; j++) { cin >> a [i] [j]; if (a [i] [j] == '@')
{ q = i; w = j; } } } k = 1; dfs(q,w); cout << k << endl; } return 0; }

#include<bits/stdc++.h>//导入输出工具库 using namespace std;//规定一个范围空间 叫std

int n , m , d , e , cnt; char a[1005][1005]; bool vis[1005][1005]; struct node{ int x, y; };

bool chicken(int x , int y){ if(x >= 1 && x <= n && y >= 1 && y <= m && a[x][y] == '.') return 1; else return 0; } node dxy[4] = {{1 , 0} , {0 , 1} , {-1 , 0} , {0 , -1}};

int bfs(int x , int y){; queue q; node t1; t1.x = x; t1.y = y; vis[t1.x ][t1.y ] = '#'; q.push(t1); cnt++; while(!q.empty()){ node t2 = q.front(); q.pop(); for(int i = 0;i < 4;i++){ node t3; t3.x = t2.x + dxy[i].x ; t3.y = t2.y + dxy[i].y ; if(chicken(t3.x , t3.y )){ a[t3.x ][t3.y ] = '#'; q.push(t3); cnt++; } }

}
return cnt;

} int main()//主程序的入口 { cin >> m >> n; for(int i = 1;i <= n;i++){ for(int j = 1;j <= m;j++){ cin >> a[i][j]; if(a[i][j] == '@'){ d = i; e = j; } } } cout << bfs(d , e); return 0; }

#include<bits/stdc++.h>
using namespace std;

const int N=1e4+10;
char n[N][N];
int w,h,cnt,ans,a,b,k=1;
int xx[4]={-1,1,0,0};
int yy[4]={0,0,1,-1};
bool f(int x,int y){
	if(n[x][y]=='.'&&x>=1&&x<=h&&y>=1&&y<=w){
		return 1;
	}
	return 0;
}

void dfs(int x,int y){
	n[x][y]='#';
	for(int i=0;i<4;i++){
		int nx=x+xx[i];
		int ny=y+yy[i];
		if(f(nx,ny)) 
		{
			k++;
		    dfs(nx,ny);
		}
	}
}

int main(){
	while(cin>>w>>h){
		if(w==0&&h==0){
			break;
		}
		for(int i=1;i<=h;i++){
			for(int j=1;j<=w;j++){
				cin>>n[i][j];
			    if(n[i][j]=='@'){
			    	a=i;b=j;
				}
			}
		}
		k=1;
		dfs(a,b);
		cout<<k<<endl;
	}
	return 0;
}

#include <bits/stdc++.h>
using namespace std;
const int N = 1e2 + 10;
char a [N] [N];
int m , n , k , q , w;
int xx [4] = {-1 , 1 , 0 , 0};
int yy [4] = {0 , 0 , 1 , -1};
bool f (int c , int d)
{
	if (a [c] [d] == '.' && c >= 1 && c <= n && d >= 1 && d <= m)
	{
		return 1;
	}
	return 0;
}
void dfs (int x , int y)
{

	a [x] [y] = '#';
	for (int i = 0; i < 4; i++)
	{
		int nx = x + xx [i];
		int ny = y + yy [i];
		if (f (nx , ny)) 
		{
			k++;
		    dfs (nx , ny);
		}
	}
}
int main()
{
	    while (cin >> m >> n)
	    {
	    	if (m == 0 && n == 0)
	    	{
	    		break;
			}
			for (int i = 1; i <= n; i++)
	        {
	    	    for (int j = 1; j <= m; j++)
			    {
				    cin >> a [i] [j];
				    if (a [i] [j] == '@')    
			        {
					    q = i;
				        w = j;
				    }
			    } 
		    }
		    k = 1;
           dfs(q,w);
		    cout << k << endl;
		}
	    return 0;
}