A piece of paper, tear it into 5 pieces for the first time, tear one of them into 5 pieces for the second time...and so on, how many small pieces of paper can you get when you tear it into 1 for the 2015th time.
一张纸片，第一次把它撕成5片，第二次把其中的一片撕成5片…如此下去，第2015次撕成一用得到多少片小纸片．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 * 2_015</gadget>
<output>8_060</output>

<gadget id="calculator">8_060 + 1</gadget>
<output>8_061</output>

<result>8_061</result>