There are 2012 people living on an island, some of them always tell lies, and the rest always tell the truth. Every inhabitant of the island worships one of the three gods: the sun god, the moon god and the earth god. A foreign interviewer asked every resident of the island three questions: 1. Do you worship the sun god? 2 Do you worship the moon god? 3 Do you worship the earth god? To the first question, 804 people answered: "Yes"; to the second question, 1004 people answered: "Yes"; to the third question, 1204 people answered: "Yes". So, how many of them are telling the truth.
在一个海岛上居住者2012人，其中一些人总是说假话，其余的人总是说真话．岛上的每一位居民都崇拜太阳神、月亮神和地球神这三个神中的一个．一位外来的采访者向岛上的每一位居民提出三个问题：1你崇拜太阳神吗？2你崇拜月亮神吗？3你崇拜地球神吗？对第一个问题，有804人回答："是"；对第二个问题，有1004人回答："是"；对第三个问题，有1204人回答："是"．那么，他们中有多少人说的是真话．
<gadget id="calculator">1_204 - 2_012</gadget>
<output>-808</output>

<gadget id="calculator">804 + 1_004 + (-808)</gadget>
<output>1_000</output>

<gadget id="calculator">2_012 - 1_000</gadget>
<output>1_012</output>

<result>1_012</result>