#include<iostream>
#include<cstdio>
#include<cmath>
#include<map>
#include<cstdlib>
#include<vector>
#include<set>
#include<queue>
#include<cstring>
#include<string.h>
#include<algorithm>
#define INF 0x3f3f3f3f
typedef long long ll;
typedef unsigned long long LL;
using namespace std;
const int N = 1e6+10;
const ll mod = 1e9+7;
int t=0,flag=0;
char s[26][26];
int visited[26][26];
int m,n;
int _x[4]={0,1,-1,0};
int _y[4]={1,0,0,-1};
int ans;
void DFS(int x,int y){
    for(int t=0;t<4;t++){
        int i=x+_x[t];
        int j=y+_y[t];
        if(i>=0&&j>=0&&visited[i][j]==0&&s[i][j]==‘.‘&&i<=n-1&&j<=m-1)
        {
            ans++;
            visited[i][j]=1;
            DFS(i,j);
        }
    }
}
int main(){
    while(scanf("%d%d",&m,&n)!=EOF){
        if(m==0&&n==0)break;
        memset(visited,0,sizeof(visited));
        int ii,jj;
        int i,j;
        for(ii=0;ii<n;ii++){
            for(jj=0;jj<m;jj++){
                cin>>s[ii][jj];
                if(s[ii][jj]==‘@‘){i=ii;j=jj;}
            }
        }
        ans=1;
        visited[i][j]=1;
        DFS(i,j);
        cout<<ans<<endl;
    }
}