There are 45 soldiers who want to cross the river to carry out their mission, but there is only one boat in the river that can carry 5 people. How many times must all the soldiers cross at least to reach the opposite bank?
有45名士兵要渡河去执行任务，但河里只有一条能载5人的小船．全体士兵到达对岸最少要分多少次渡．
<gadget id="calculator">45 - 5</gadget>
<output>40</output>

<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<result>11</result>