There are 54 cards in a deck, including 4 cards from 1 to 13 points, and two trump cards. At least how many cards must be taken out to ensure that 4 cards have the same points.
一副扑克牌共54张，其中1～13点各有4张，还有两张王牌，至少要取出多少张牌，才能保证其中必有4张牌的点数相同．
<gadget id="calculator">3 * 13</gadget>
<output>39</output>

<gadget id="calculator">39 + 2</gadget>
<output>41</output>

<gadget id="calculator">41 + 1</gadget>
<output>42</output>

<result>42</result>