Wolf Castle holds a new castle master election meeting, and each wolf votes to choose one of the three candidates A, B, and C. It is known that there are 54 wolves in the whole castle. At present, A gets 15 votes, B gets 15 votes, and C gets 12 votes. If the candidate who gets more votes than the other two wolves will become the new castle owner. Then, at least how many more votes A can get to guarantee the election.
狼堡举行新堡主选举大会，每只狼投票从A、B、C三位候选者中选择一只．己知全堡共有54只狼，目前，A得到15票，B得到15票，C得到12票．如果得票比其它两只狼都多的候选者将成为新堡主．那么，A至少再得到多少票就能够保证当选．
<gadget id="calculator">15 + 15 + 12</gadget>
<output>42</output>

<gadget id="calculator">54 - 42</gadget>
<output>12</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<result>7</result>