There are a number of story books distributed to some students. If there are 4 books per person, or 5 books per person, or 6 books per person, there will be one less book. How many storybooks are there at least in this batch?
有若干本故事书分给一些同学，若按每人4本，或每人5本，或每人6本分，都少1本．这批故事书至少有多少本？
<gadget id="calculator">2 * 2 * 3 * 5</gadget>
<output>60</output>

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

<result>59</result>