There are 41 students in Class 1. The teacher has to give each student a pencil. The pencils in the store come in packs of 5 or 3. They cannot be opened for retail sale. A pack of 5 is 20 yuan. 3 a pack of 14 yuan per pack. If you go to help the teacher to buy, how to buy the most economical? How much do you share?
六1班有41名学生，老师要给每个同学发一支铅笔，商店里的铅笔都是5支一包或3支一包的，不能打开零售，5支一包的每包20元，3支一包的每包14元．如果你去帮老师买，怎样买最省钱？共用多少钱．
<gadget id="calculator">20 * 7</gadget>
<output>140</output>

<gadget id="calculator">14 * 2</gadget>
<output>28</output>

<gadget id="calculator">140 + 28</gadget>
<output>168</output>

<result>168</result>