Children's Day is approaching. The school has set up a square flower bed. There are 20 potted flowers on each side of the outermost layer of the flower bed. How many potted flowers are placed in the outermost layer? What about the entire phalanx?
六一儿童节快到了，学校摆了一个方阵花坛，这个花坛最外层每边各放20盆花，最外层一共摆了多少盆花？整个方阵呢？
<gadget id="calculator">20 * 4</gadget>
<output>80</output>

<gadget id="calculator">80 - 4</gadget>
<output>76</output>

<result>76</result>