public synchronized static int countBrothers(ArrayList<Ant> ants) {
		int brothers = 0;
		for (int a = 0; a < ants.size(); a++) {
			boolean brothersOk = false;
			for (int b = 0; b < ants.size(); b++) {
				if (a != b) {
					if (!isTheBrother(ants.get(a), ants.get(b))) {
						brothersOk = true;
					}
				}
			}
			if (brothersOk) {
				brothers++;
			}
		}
		return brothers;
	}