private void item_plus() throws Exception {
		if (token.tag == Tag.MULTI || token.tag == Tag.DIV) {
			nextToken();
			item();
		}
		if (token.tag == Tag.ADD || token.tag == Tag.SUB
				|| token.tag == Tag.SEMICOLON || token.tag == Tag.RP
				|| token.tag == Tag.END) {
			//nextToken();
			return;
		} else
			throw new Exception();
	}