There are 45 students in the first preparatory class of a certain school. One squadron leader is elected by voting. The candidates include Zhang Ying, Liu Qiang, and Wang Hua. It is stipulated that each student can only choose one candidate, and the candidate with the most votes is elected. During the election process There was a statistics, at that time Zhang Ying got 12 votes, Liu Qiang got 10 votes, Wang Hua got 9 votes, and the result of the final vote was that Liu Qiang was elected, then among the remaining votes, how many votes did Liu Qiang get at least?
某校预备1班有45人，通过投票选举1名中队长，候选人有张英、刘强、王华，规定每位同学只能选1名候选人，票数最多的候选人当选，选举过程中有过一次统计，当时张英得12票，刘强得10票，王华得9票，最后投票结果是刘强当选，那么剩下的选票中，刘强至少得到多少票．
<gadget id="calculator">45 / 3</gadget>
<output>15</output>

<gadget id="calculator">1 - 10</gadget>
<output>-9</output>

<gadget id="calculator">15 + (-9)</gadget>
<output>6</output>

<result>6</result>