There is a steel pipe to be sawed into 16 small sections. It takes 3 points to saw each part, how many points will it cost to saw all the parts?
有一根钢管，要锯成16小段．每锯开一处需要3分，全部锯完一共要多少分？
<gadget id="calculator">16 - 1</gadget>
<output>15</output>

<gadget id="calculator">3 * 15</gadget>
<output>45</output>

<result>45</result>