#include<bits/stdc++.h>
using namespace std;
int n,m,ans;
char a[21][21];
void dfs(int x,int y)
{
	ans++;
	if(a[x+1][y]=='.') a[x+1][y]='#',dfs(x+1,y);
	if(a[x][y+1]=='.') a[x][y+1]='#',dfs(x,y+1);
	if(a[x-1][y]=='.') a[x-1][y]='#',dfs(x-1,y);
	if(a[x][y-1]=='.') a[x][y-1]='#',dfs(x,y-1);
}
int main(){
	cin>>m>>n;
	for(int i=1;i<=n;i++)
	{
		for(int j=1;j<=m;j++)
		{
			cin>>a[i][j];
		}
	}
	for(int i=1;i<=n;i++)
	{
		for(int j=1;j<=m;j++)
		{
			if(a[i][j]=='@') dfs(i,j);
		}
	}
	cout<<ans;
}
/**************************************************************
	Problem: 1897
	User: wuyunfeng
	Language: C++
	Result: Accepted
	Time:18 ms
	Memory:2072 kb
****************************************************************/