A small insect jumps up a straight tree trunk, and each jump is 4 cm higher than the previous one. It starts to jump from 10 centimeters above the ground. If this place is called the bug's first foothold, then its 100th foothold is exactly the treetop. How many centimeters is the tree high?
一只小虫沿笔直的树干跳着往上行，每跳一次都比上一次升高4厘米．它从离地面10厘米处开始跳，如果把这一处称为小虫第一次落脚点，那么它的第100个落脚点正好是树梢，这棵树高多少厘米．
<gadget id="calculator">100 - 1</gadget>
<output>99</output>

<gadget id="calculator">4 * 99</gadget>
<output>396</output>

<gadget id="calculator">10 + 396</gadget>
<output>406</output>

<result>406</result>