53 soldiers have to cross the river by boat, but there is only one boat at the ferry that can carry 5 people (no boatman)? At least how many times will they all have to use this boat to cross the river?
53个战士要坐船过河，渡口处只有一只能载5人的小船(无船工)？他们要全部渡过河去，至少要使用这只小船渡河多少次？
<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<gadget id="calculator">12 + 1</gadget>
<output>13</output>

<result>13</result>