#include <iostream>

char table[100][100];
using namespace std;


int f(int w, int h, int x, int y){
  int ret = 0;
  if(x < 0 || y < 0 || x >= w || y >= h){
    return 0;
  }
  if(table[y][x] == '#'){
    return 0;
  }
  ret = 1;
  table[y][x] = '#';
  ret += f(w, h, x, y + 1);
  ret += f(w, h, x, y - 1);
  ret += f(w, h, x - 1, y);
  ret += f(w, h, x + 1, y);
  return ret;
}

int main(){
  while(true){
    int startX, startY;
    int width, height;
    cin >> width >> height;
    if(width == 0 && height == 0){
      break;
    }
    for(int i = 0; i < height; i++){
      for(int j = 0; j < width; j++){
        cin >> table[i][j];
        if(table[i][j] == '@'){
          //cout << "startX = " << j << " startY = " << i << endl;
          startX = j;
          startY = i;
          table[i][j] = '.';
        }
      }
      
    }
    cout << f(width, height, startX, startY) << endl;
  }
}