A rectangle divides the plane into two parts. How many parts can the plane be divided into at most by 10 rectangles?
一个长方形把平面分成两部分，10个长方形最多能把平面分成多少部分．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">10 * 9 * 4</gadget>
<output>360</output>

<gadget id="calculator">2 + 360</gadget>
<output>362</output>

<result>362</result>