On New Year's Day in 2016, the students placed flower pots on the four sides of the square flag-raising platform with a side length of 4 meters, and the interval was 1 meter. How many flower pots can be placed in total.
2016年元旦节那天，同学们给边长是4米的正方形升旗台的四边摆上花盆，间隔是1米，一共可以摆多少个花盆．
<gadget id="calculator">4 / 1</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>