The beautiful goat was captured by Big Big Wolf, and Pleasant Goat was going to Wolf Fort to rescue the beautiful goat. Pleasant Goat set off from Yangcun, walked 50 meters, and suddenly realized that he did not bring the invisibility potion given by the village head grandfather, so he went back to Yangcun to get it, and then Going to rescue the beautiful sheep, there is a total distance of 200 meters from Yangcun to Wolf Fort, so how many meters does it take for Pleasant Goat to successfully rescue the beautiful sheep and bring it back to Yangcun?
美羊羊被灰太狼抓走了，喜羊羊要去狼堡救美羊羊，喜羊羊从羊村出发，走了50米突然想到自己没有带村长爷爷给的隐形药水，又返回羊村去取，然后再去救美羊羊，从羊村到狼堡共有200米的路程，那请问喜羊羊把美羊羊成功解救并带回羊村一共要走多少米的路程．
<gadget id="calculator">200 * 2</gadget>
<output>400</output>

<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">400 + 100</gadget>
<output>500</output>

<result>500</result>