Xiaobao remembers that the English word "he11o" is composed of three different letters h, e, o and two identical letters l, but he does not remember the order of arrangement, how many spelling mistakes Xiaobao may make.
小宝记得英语单词"he11o"是由三个不同的字母h，e，o和两个相同的字母l组成的，但不记得排列顺序，则小宝可能出现的拼写错误共有多少种．
<gadget id="calculator">5 * 4 * 3 * 2 * 1</gadget>
<output>120</output>

<gadget id="calculator">120 / 2</gadget>
<output>60</output>

<gadget id="calculator">60 - 1</gadget>
<output>59</output>

<result>59</result>