If a positive integer is divided by 5, the remainder is 3, when divided by 7, the remainder is 5, and when divided by 9, the remainder is 7. What is the smallest positive integer?
一个正整数除以5余3，除以7余5，除以9余7，则这个正整数最小是多少．
<gadget id="calculator">5 * 7 * 9</gadget>
<output>315</output>

<gadget id="calculator">315 - 2</gadget>
<output>313</output>

<result>313</result>