#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;
}