Xiao Cong makes a cylindrical pen holder, the height of the pen holder is 13 cm, and the diameter of the bottom surface is 10 cm. She wants to paste colored paper on the side and bottom of the pen holder. How much colored paper does she need at least?
小聪做一个圆柱形笔筒，笔筒的高为13厘米，底面直径为10厘米，她想给笔筒的侧面和底部贴上彩纸，至少需要多少彩纸？
<gadget id="calculator">3.14 * 10 * 13</gadget>
<output>408.2</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<gadget id="calculator">408.2 + 78.5</gadget>
<output>486.7</output>

<result>486.7</result>