#include<bits/stdc++.h>
using namespace std;
int n,m,sx,sy,ans=1;
char a[21][21];
int fx[4]={0,1,0,-1};
int fy[4]={1,0,-1,0};
void dfs(int x,int y){
	a[x][y]='#';
	for(int i=0;i<=3;i++){
		int tx=x+fx[i];
		int ty=y+fy[i];
		if(tx>=1&&tx<=n&&ty>=1&&ty<=m&&a[tx][ty]!='#'){
			ans++;
			dfs(tx,ty);
		}
	}
}
int main(){
	cin>>m>>n;
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
			cin>>a[i][j];
			if(a[i][j]=='@'){
				sx=i;
				sy=j;
			}
		}
	}
    dfs(sx,sy);
	cout<<ans;	
	return 0;
}

/**************************************************************
	Problem: 1897
	User: linyifan
	Language: C++
	Result: Accepted
	Time:21 ms
	Memory:2072 kb
****************************************************************/