In a basket of apples, 6 apples are taken and 4 are left, 7 apples are taken and 5 are left, and 8 apples are taken and 6 is left. How many apples are there at least in this basket? If there are about 500 apples, how many apples are there in this basket?
一筐苹果，6个一拿剩4个，7个一拿剩5个，8个一拿剩6个，这筐苹果至少有多少个？如果大约有500个，那么这筐苹果有多少．
<gadget id="calculator">2 * 2 * 2 * 3 * 7</gadget>
<output>168</output>

<gadget id="calculator">168 * 3</gadget>
<output>504</output>

<gadget id="calculator">504 - 2</gadget>
<output>502</output>

<result>502</result>