The red flag phalanx in the parade has 10 flag bearers in each row horizontally and vertically. How many flag bearers are there on the outermost periphery?
游行队伍中的红旗方阵，横、竖每行都是10个旗手，它的最外围有多少个旗手．
<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<gadget id="calculator">40 - 4</gadget>
<output>36</output>

<result>36</result>