The total number of students in the fifth grade of a primary school is an even number with three digits. If the total number is divided by 5 after subtracting 3, if it is divisible by 7 after subtracting 5, and if it is divisible by 9 after subtracting 7, then how many students are there in the fifth grade?
某小学五年级总人数是个三位偶数，将总人数减去3能被5整除，减去5能被7整除，减去7能被9整除，则该小学五年级共有多少人．
<gadget id="calculator">5 * 7 * 9</gadget>
<output>315</output>

<gadget id="calculator">315 * 2</gadget>
<output>630</output>

<gadget id="calculator">630 - 2</gadget>
<output>628</output>

<result>628</result>