The number of students in the third and fourth grades is 100 more than the number of students in the first and second grades, but 53 students are less than the number of students in the fifth and sixth grades. It is known that the number of students in the fifth and sixth grades is the same as the number of students in the first and second grades is a perfect square number, how many people are there in the school?
三、四年级的学生人数比一、二年级的学生人数多100人，但比五、六年级的学生人数少53人，已知五、六年级的学生人数和一、二年级的学生人数都是完全平方数，那么该学校一共有多少人？
<gadget id="calculator">676 - 100</gadget>
<output>576</output>

<gadget id="calculator">676 + 53</gadget>
<output>729</output>

<gadget id="calculator">576 + 676 + 729</gadget>
<output>1_981</output>

<result>1_981</result>