#include <bits/stdc++.h>
using namespace std;
int n,m; 
char a[25][25];
int fx[4]={0,1,0,-1};
int fy[4]={1,0,-1,0};
int ans;
void dfs(int x,int y){
	ans++;
	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]=='.'){
			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];
    }
    for(int i=1;i<=n;i++){
    	for(int j=1;j<=m;j++){
    		if(a[i][j]=='@'){
    			ans=1;
    			dfs(i,j);
    		}
    	}
    }
    cout<<ans<<endl;
	return 0;
}
/**************************************************************
	Problem: 1900
	User: zengdongxin
	Language: C++
	Result: Memory Limit Exceed
****************************************************************/