A sidewalk is 120 meters long. Now it is necessary to pave the sides of the sidewalk with a width of 60 cm and use square bricks with a side length of 2 decimeters. How many pieces are needed in total?
一条人行道长120米，现在要在人行道的两侧铺上宽是60厘米的边，用边长为2分米的方砖来铺，一共需要多少块？
<gadget id="calculator">0.2 * 0.2</gadget>
<output>0.04</output>

<gadget id="calculator">0.6 / 0.04</gadget>
<output>15</output>

<gadget id="calculator">120 * 15</gadget>
<output>1_800</output>

<gadget id="calculator">1_800 * 2</gadget>
<output>3_600</output>

<result>3_600</result>