Put several apples into 8 drawers. No matter how you put them, you must ensure that there is always at least 3 apples in one drawer. So what should be the total number of apples at least?
把若干个苹果放进8个抽屉里，不管怎么放，要保证总有一个抽屉里至少放进3个苹果，那么苹果的总数至少应该是多少个？
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

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

<result>17</result>