The sum of a number and 3 is a multiple of 7, and the difference with 5 is a multiple of 8. What is the smallest number?
一个数与3的和是7的倍数，与5的差是8的倍数，这个数最小的多少．
<gadget id="calculator">7 * 8</gadget>
<output>56</output>

<gadget id="calculator">56 - 3</gadget>
<output>53</output>

<result>53</result>