#include <iostream>
#include <cstdio>

using namespace std;

int main(void)
{
  int w, h;
  int array[500];
  int i, j, k;
  char buf[128];
  int count;
  int left;
  int xd[4]={1,0,-1,0};
  int yd[4]={0,1,0,-1};
  int x, y;
  while ( fgets(buf,128,stdin)==buf &&
	  sscanf(buf, "%d%d", &w, &h)==2 &&
	  w!=0 && h!=0 ) {
    for ( j=0 ; j<h ; j++ ) {
      fgets(buf,128,stdin);
      for ( i=0 ; i<w ; i++ ) {
	array[i+j*w]=buf[i];
      }
    }
    count=0;
    left=1;
    while ( left>0 ) {
      left=0;
      for ( j=0 ; j<h ; j++ ) {
	for ( i=0 ; i<w ; i++ ) {
	  if ( array[i+j*w]=='@' ) {
	    count++;
	    array[i+j*w]='#';
	    for ( k=0 ; k<4 ; k++ ) {
	      x=i+xd[k];
	      y=j+yd[k];
	      if ( x<0 || w<=x || y<0 || h<=y )
		continue;
	      if ( array[x+y*w]=='.' ) {
		array[x+y*w]='@';
		left++;
	      }
	    }
	  }
	}
      }
    }
    printf("%d\n", count);
  }
}