There are 12 poker cards that are shuffled and buckled on the table. Among them, 5 are hearts and 7 are spades. At least how many cards must be drawn to ensure that hearts can be drawn.
有12张扑克牌打乱后反扣在桌面上，其中有5张是红桃，7张黑桃，至少要摸出多少张扑克牌，才能保证一定能摸到红桃．
<gadget id="calculator">7 + 1</gadget>
<output>8</output>

<result>8</result>