The taxi billing method in a certain city is that the starting price is 4 yuan within 3 kilometers. A fee of 0.8 yuan per 1 kilometer is charged for each trip beyond 3 kilometers (less than 1 kilometer is charged as 1 kilometer). It took Uncle Li a total of 12 yuan to take a taxi from home to the company. How many kilometers is the furthest away from Uncle Li's home to the company?
某市出租车计费办法是3千米以内收起步价4元．3千米以外每行1千米收费0.8元(不足1千米按1千米收取)．李叔叔从家到公司乘出租车共花了12元．李叔叔家离公司最远多少千米？
<gadget id="calculator">12 - 4</gadget>
<output>8</output>

<gadget id="calculator">8 / 0.8</gadget>
<output>10</output>

<gadget id="calculator">10 + 3</gadget>
<output>13</output>

<result>13</result>