#include<iostream>
#include<cstring>
using namespace std;
const int N = 25;
char a[N][N];
bool s[N][N];
int n, m;
int dx[4] = {-1, 0, 1, 0};
int dy[4] = {0, 1, 0, -1};

int dfs(int x, int y, int res)
{
    s[x][y] = true;
    res++;
    for(int i = 0; i < 4; i++)
    {
        int xi = x + dx[i];
        int yi = y + dy[i];

        if(xi > 0 && yi > 0 && xi <= n && yi <= m && !s[xi][yi] && a[xi][yi] == '.')
        {
//          cout << xi << " " << yi << endl;
            res += dfs(xi, yi, 0);
        }
    }
    return res;
}

int main()
{
    cin >> m >> n;
    while(n && m)
    {
        int x, y;
        memset(s, 0, sizeof(s));
        for(int i = 1; i <= n; i++)
        {
            for(int j = 1; j <= m; j++)
            {
                cin >> a[i][j]; 
                if(a[i][j] == '@')  x = i, y = j;   

            }       
        }   
//      cout << x << " " << y << endl;
        cout << dfs(x, y, 0) << endl;
        cin >> m >> n;
    }

    return 0;
}