Points P, Q, R and S are four different points on the straight line, among which point Q and point R are located between point P and point S, and PS=10 meters, QR=3 meters. What is the sum of the lengths of all line segments with these four points as endpoints?
点P、Q、R及S为直线上四个不同的点，其中点Q及点R位于点P及点S之间，且PS=10米，QR=3米．则以这四个点为端点的所有线段长度总和为多少米？
<gadget id="calculator">10 + 3 + 10 + 10</gadget>
<output>33</output>

<result>33</result>