The inner diameter of the ring is 5 cm, and the outer diameter is 6 cm. If 100 such rings are connected one by one to form a chain, what is the length of the chain after straightening? (The shape of each ring does not change after straightening)
圆环的内直径为5厘米，外直径为6厘米，将100个这样的圆环一个接一个环套环的连成一条锁链，那么这条锁链拉直后的长度为多少厘米．(拉直后每个圆环的形状不变)
<gadget id="calculator">6 - 5</gadget>
<output>1</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">100 - 1</gadget>
<output>99</output>

<gadget id="calculator">5 * 99</gadget>
<output>495</output>

<gadget id="calculator">6 + 495</gadget>
<output>501</output>

<result>501</result>