There are 4 cards with 1, 2, 3, and 4 written on them, and 1, 2, and 3 cards are drawn from them, and arranged in any order to get different one-digit, two-digit, and three-digit numbers, then among them How many prime numbers are there in .
有4张分别写有1，2，3，4的卡片，从中抽出1张，2张，3张，以任意次序排起来可以得到不同的一位数、二位数，三位数，那么其中的质数有多少个．
<gadget id="calculator">2 + 5 + 1 + 12</gadget>
<output>20</output>

<result>20</result>