There are 1,000 students in Peiying School, 500 of them subscribed to "China Youth Daily", 350 subscribed to "Youth Literature and Art", 250 subscribed to "Mathematics Journal", and 400 subscribed to at least two newspapers. There are 100 people who have subscribed to the three newspapers. I would like to ask: How many people in Peiying School have not subscribed to the newspaper?
培英学校有学生1000人，其中有500人订阅了《中国少年报》，有350人订阅了《少年文艺》，有250人订阅了《数学报》，至少订阅两种报刊的有400人，订阅了三种报刊的有100人．请问：培英学校有多少人没有订报？
<gadget id="calculator">250 - 400</gadget>
<output>-150</output>

<gadget id="calculator">500 + 350 + (-150) + 100</gadget>
<output>800</output>

<gadget id="calculator">1_000 - 800</gadget>
<output>200</output>

<result>200</result>