When a number is divided by 3, the quotient is 17 and the remainder is 2. What is the number?
一个数除以3，商是17，余数是2，这个数是多少．
<gadget id="calculator">3 * 17</gadget>
<output>51</output>

<gadget id="calculator">51 + 2</gadget>
<output>53</output>

<result>53</result>