#include <iostream>
using namespace std;

int paint(int (*bd)[20],int w,int h,int x,int y)
{
  if (!(x>=0&&x<w&&y>=0&&y<h)||bd[y][x]==1)
    return 0;

  bd[y][x]=1;
  int ret=1;
  static const int v[]={0,1,1,0,0,-1,-1,0};
  for (int i=0;i<8;i+=2)
    ret+=paint(bd,w,h,x+v[i],y+v[i+1]);
  return ret;
}

int main(){
  for (;;){
    int w,h;
    cin>>w>>h;
    int bd[20][20];
    if (w==0&&h==0) break;

    int sx,sy;
    for (int y=0;y<h;y++){
      for (int x=0;x<w;x++){
        char c;
        cin>>c;
        if (c=='.') bd[y][x]=0;
        if (c=='#') bd[y][x]=1;
        if (c=='@'){
          bd[y][x]=0;
          sx=x;
          sy=y;
        }
      }
    }
    int ans=paint(bd,w,h,sx,sy);
    cout<<ans<<endl;
  }
  return 0;
}