From 2 sticks 3 cm long and 2 sticks 7 cm long, choose 3 sticks to form an isosceles triangle. What is the perimeter of the formed isosceles triangle in cm?
从2根3厘米长和2根7厘米长的小棒中，选出3根围成一个等腰三角形，围成的等腰三角形的周长是多少厘米．
<gadget id="calculator">7 + 7 + 3</gadget>
<output>17</output>

<result>17</result>