There are 54 cards in a deck of cards, 13 each for spades, hearts, clubs, and diamonds, and 2 aces. At least how many cards are taken from it to ensure that there are 2 cards of 4 suits.
一副扑克牌一共有54张，黑桃、红桃、梅花、方块各有13张，还有2张王牌．至少从中取出多少张牌，才能保证4种花色的牌都有2张．
<gadget id="calculator">3 * 13</gadget>
<output>39</output>

<gadget id="calculator">39 + 2 + 2</gadget>
<output>43</output>

<result>43</result>