Paint the surface of a cuboid with a length of 5, a width of 3, and a height of 1, and then cut it into 15 small cubes with an edge length of l. Then how many small cubes are there that are painted on three sides?
将长为5，宽为3，高为1的长方体木块的表面涂上漆，再切成15块棱长为l的小正方体．则三个面涂漆的小正方体有多少块．
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

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

<result>8</result>