#include <iostream>
#include <stl.h>

using namespace std;

const int dr[]={0,1,0,-1};
const int dc[]={1,0,-1,0};

int Solve(int row,int col,vector<vector<char> >& mat)
{
    int ans = 1;
    mat[row][col] = 0;
    for(int i = 0 ; i < 4 ; i++)
	if(mat[row+dr[i]][col+dc[i]] == '.')
	    ans += Solve(row+dr[i],col+dc[i],mat);
    return ans;
}

int main()
{
    int row,col,srow,scol;
    while(cin >> col >> row , col || row)
    {
	vector<vector<char> > mat(row+2,vector<char> (col+2,0));
	for(int i = 1 ; i <= row ; i++)
	    for(int j = 1 ; j <= col ; j++)
	    {
		cin >> mat[i][j];
		if(mat[i][j] == '@')
		{
		    mat[i][j] = '.';
		    srow = i;
		    scol = j;
		}
	    }
	cout << Solve(srow,scol,mat) << endl;
    }
    return 0;
}