There are 386 students in the fourth grade of Sunflower Primary School, the number of students in the fifth grade is twice that of the fourth grade, and the number of students in the sixth grade is 158 fewer than the sum of the fourth and fifth grades. How many students are there in grade six?
向日葵小学四年级有学生386人，五年级学生人数是四年级的2倍，六年级的学生比四、五年级的总和少158人．六年级有学生多少人？
<gadget id="calculator">386 * 2</gadget>
<output>772</output>

<gadget id="calculator">386 - 158</gadget>
<output>228</output>

<gadget id="calculator">772 + 228</gadget>
<output>1_000</output>

<result>1_000</result>