#include <iostream>

using namespace std;

int pacex[5]={0,-1,1,0,0},pacey[5]={0,0,0,1,-1},count=1;


inline void work(int x,int y,int a[][23])
{
	int i,tempx,tempy;
	for (i=1;i<=4;i++)
	{
		tempx=x+pacex[i];
		tempy=y+pacey[i];
		if (a[tempx][tempy]==0)
		{
			count++;
			a[tempx][tempy]=1;
			work(tempx,tempy,a);
		}
	}
}

void main()
{	
	int a[23][23];
	int m,n,i,j;
	for (i=0;i<=22;i++)
		for (j=0;j<=22;j++)
			a[i][j]=1;

	char in,starti,startj;

	while (1)
	{
		for (i=1;i<=n;i++)
			for (j=1;j<=m;j++)
				a[i][j]=1;
		cin>>m>>n;
		if (m==0&&n==0) break;


		for (i=1;i<=n;i++)
			for (j=1;j<=m;j++)
			{
				cin>>in;
				if (in=='.')
					a[i][j]=0;
				if (in=='#')
					a[i][j]=1;
				if (in=='@')
				{
					a[i][j]=1;
					starti=i;
					startj=j;
				}
			}
		work(starti,startj,a);
		cout<<count<<endl;
		count=1;
	}
}