Put a square array with flowerpots, there are 60 potted flowers in the outermost layer, how many potted flowers are there on each side of the outermost layer of the square array.
用花盆摆一个方阵，最外层共有60盆花，方阵最外层每边有多少盆花．
<gadget id="calculator">60 + 4</gadget>
<output>64</output>

<gadget id="calculator">64 / 4</gadget>
<output>16</output>

<result>16</result>