// 2004�‘“à—\‘IB Red and Black

#include <iostream>
#include <string>
#include <queue>

using namespace std;

int dx[] = {0, 1, 0, -1};
int dy[] = {1, 0, -1, 0};

int main(){
	int w, h;
	string b[20];
	while(cin >> w >> h, w){
		for(int i=0;i<h;i++) cin >> b[i];
		int sx, sy;
		for(int i=0;i<h;i++)
			for(int j=0;j<w;j++)
				if(b[i][j]=='@') sx = i, sy = j;
		queue< pair<int, int> > qu; qu.push(make_pair(sx,sy));
		int res = 0;
		while(!qu.empty()){
			pair<int, int> pr = qu.front(); qu.pop();
			int x = pr.first, y = pr.second;
			res++;
			for(int i=0;i<4;i++){
				int nx = x+dx[i], ny = y+dy[i];
				if(nx<0||h<=nx||ny<0||w<=ny||b[nx][ny]!='.') continue;
				b[nx][ny] = '#';
				qu.push(make_pair(nx,ny));
			}
		}
		cout << res << endl;
	}
}