When a number is divided by 3, the quotient is 57 and the remainder is 2. What is the number?
一个数除以3，商是57，余数是2，这个数是多少．
<gadget id="calculator">57 * 3</gadget>
<output>171</output>

<gadget id="calculator">171 + 2</gadget>
<output>173</output>

<result>173</result>