How many days are there from July 15th to August 5th?
从7月15日到8月5日一共有多少天．
<gadget id="calculator">31 - 15</gadget>
<output>16</output>

<gadget id="calculator">16 + 1</gadget>
<output>17</output>

<gadget id="calculator">17 + 5</gadget>
<output>22</output>

<result>22</result>