There is a game with a total of ten levels, starting from the first level, and entering the next level after passing a level. You can get up to 800 points for each level, and you can get a reward for every 1000 points, and each reward is up to 500 points. After passing the fourth level, how many points can you get at most?
有一种游戏，共设有十个关卡，从第一关开始，每过一关进入下一关．每一关最多可得800分，另外每满1000分就可以获得一次奖励，每一次奖励最多为500分．过完第四关后，最多可以得多少分．
<gadget id="calculator">800 + 800</gadget>
<output>1_600</output>

<gadget id="calculator">1_600 + 500</gadget>
<output>2_100</output>

<gadget id="calculator">2_100 + 500</gadget>
<output>2_600</output>

<gadget id="calculator">2_600 + 800</gadget>
<output>3_400</output>

<gadget id="calculator">3_400 + 500</gadget>
<output>3_900</output>

<gadget id="calculator">3_900 + 800</gadget>
<output>4_700</output>

<gadget id="calculator">4_700 + 500</gadget>
<output>5_200</output>

<gadget id="calculator">5_200 + 500</gadget>
<output>5_700</output>

<result>5_700</result>