There are 5 yellow buttons, 4 green buttons, and 3 black buttons in a box, at least how many buttons must be taken out to ensure that there must be yellow buttons among them.
在一个盒子里放着5个黄扣子，4个绿扣子，3个黑扣子，至少要拿出多少个扣子，才能保证其中一定有黄扣子．
<gadget id="calculator">3 + 4 + 1</gadget>
<output>8</output>

<result>8</result>