> #include<iostream.h>
> char blocks[20][21];
> bool visit[20][21];
> int num;
> int W,H;
> int x,y;
> void markBlocks(int ,int);
> void main()
> {
> 	int i,j;
> 	cin>>W>>H;
> 	while(W!=0 && H!=0)
> 	{
> 		for(i=0;i<H;i++)
> 		{
> 			for(j=0;j<W;j++)
> 			{
> 				visit[i][j]=false;
> 				blocks[i][j]='0';
> 			}
> 		}
> 		cin.getline(blocks[0],20);
> 		for(i=0;i<H;i++)
> 		{
> 			cin.getline(blocks[i],W+1,'\n');
> 			cin.getline(blocks[i+1],20,'\n');
> 		}
> 		for(i=0;i<H;i++)
> 		{
> 			for(j=0;j<W;j++)
> 			{		
> 				if(blocks[i][j]=='@')
> 				{
> 					x=i;
> 					y=j;
> 					break;
> 				}
> 			}
> 			if(y==j)
> 				break;
> 		}
> 		num=0;
> 		markBlocks(x,y);
> 		cout<<num<<endl;
> 		cin>>W>>H;
> 	}
> }
> void markBlocks(int x,int y)
> {
> 	if(visit[x][y])
> 		return;
> 	else
> 	{
> 		visit[x][y]=true;
> 		num++;
> 	}
> 	if(blocks[x+1][y]=='.')
> 		markBlocks(x+1,y);
> 	if(blocks[x-1][y]=='.')
> 		markBlocks(x-1,y);
> 	if(blocks[x][y+1]=='.')
> 		markBlocks(x,y+1);
> 	if(blocks[x][y-1]=='.')
> 		markBlocks(x,y-1);
> }
> 
> 
>