#include<bits/stdc++.h>
using namespace std;
int w,h,b,c,ans=1;
char a[21][21];
int fx[5]={0,1,0,-1};
int fy[5]={1,0,-1,0};
void dfs(int x,int y){
	
	for(int i=0;i<=3;i++){
		int tx=x+fx[i];
		int ty=y+fy[i];
		if(tx>0&&tx<=h&&ty>0&&ty<=w&&a[tx][ty]=='.'){
			a[tx][ty]='#';
			ans++;
			dfs(tx,ty);
		}
	}
}
int main(){
    cin>>w>>h;
    for(int i=1;i<=h;i++){
    	for(int j=1;j<=w;j++){
    		cin>>a[i][j];
    	}
    }
    for(int i=1;i<=h;i++){
    	for(int j=1;j<=w;j++){
    		if(a[i][j]=='@'){
    			b=i;
    			c=j;
    			a[i][j]='#';
    			break;
    		}
    	}
    }
    		
    		dfs(b,c);
    		cout<<ans;

	return 0;
}

/**************************************************************
	Problem: 1897
	User: chenjingqi
	Language: C++
	Result: Accepted
	Time:16 ms
	Memory:2072 kb
****************************************************************/