include <bits/stdc++.h>

using namespace std; int w, h, ans, x, y; bool bj[55][55];

void dfs(int x, int y) {

ans++;
bj[x][y] = 0;

if (bj[x - 1][y] == 1) {
	dfs(x - 1, y);
}

if (bj[x + 1][y] == 1) {
	dfs(x + 1, y);
}

if (bj[x][y - 1] == 1) {
	dfs(x, y - 1);
}

if (bj[x][y + 1] == 1) {
	dfs(x, y + 1);
}

return;

}

int main() {

cin >> h >> w;
char s;

for (int i = 1; i <= w; i++) {

	for (int j = 1; j <= h; j++) {

		cin >> s;

		if (s == '@') {
			x = i;
			y = j;
			bj[i][j] = 1;
		} else if (s == '.') {
			bj[i][j] = 1;
		}
	}
}

dfs(x, y);
cout << ans;
return 0;

}