When a number is divided by 4, the quotient is 13. If the remainder is the largest, what is the number.
一个数除以4，商是13，要是余数最大，这个数是多少．
<gadget id="calculator">13 * 4</gadget>
<output>52</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">52 + 3</gadget>
<output>55</output>

<result>55</result>