Plant trees around the square pond, and plant one tree at each of the four vertices, so that there are 25 trees on each side. How many trees are planted in total?
在正方形池塘四周种树，四个顶点都种一棵，这样每边都有25棵，四周一共种树多少棵？
<gadget id="calculator">25 * 4</gadget>
<output>100</output>

<gadget id="calculator">100 - 4</gadget>
<output>96</output>

<result>96</result>