The numbers of symmetry axes of rectangle, equilateral triangle and semicircle are X, Y and Z respectively, then what is X**2+YZ=.
长方形、等边三角形、半圆形的对称轴的条数分别是X、Y、Z，则X**2+YZ=多少．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3 * 1</gadget>
<output>3</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<result>7</result>