An athlete trains in a swimming pool. The length of the swimming pool is 50 meters. He swims 8 times. How many meters did he swim?
一个运动员在游泳池内训练，游泳池长50米，他游了8个来回，他游了多少米．
<gadget id="calculator">50 * 2 * 8</gadget>
<output>800</output>

<result>800</result>