#include <iostream>

#define N (20)

#define BLACK   (0)
#define RED     (-1)

using namespace std;

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

int main(void)
{
	int m[N][N];
	int w, h;

	while(cin >> w >> h) {
		if(w == 0 && h == 0) break;

		for(int j = 0; j < h; j++) {
			for(int i = 0; i < w; i++) {
				char c;
				cin >> c;
				m[i][j] = (c == '#') ? RED : BLACK;
				if(c == '@') m[i][j] = 1;
			}
		}

		int sol = 1;
		int n = 1;
		bool flag = true;

		while(flag) {
			flag = false;
			for(int j = 0; j < h; j++) {
				for(int i = 0; i < w; i++) {
					if(m[i][j] != n) continue;
					for(int dir = 0; dir < 4; dir++) {
						int x = i + dx[dir];
						int y = j + dy[dir];
						if(x < 0 || x >= w || y < 0 || y >= h) continue;
						if(m[x][y] != BLACK) continue;
						m[x][y] = n;
						++sol;
						flag = true;
					}
				}
			}
		}

		cout << sol << endl;
	}

	return 0;
}