There are five natural numbers, among which the first number is less than twice the second number, the second number is less than three times the third number, the third number is less than four times the fourth number, and the fourth number is If it is less than 5 times the fifth number, and the fifth number is less than 100, what is the maximum value of the first number?
现有五个自然数，其中第一个数小于第二个数的2倍，第二个数小于第三个数的3倍，第三个数小于第四个数的4倍，第四个数小于第五个数的5倍，而第五个数小于100，那么第一个数的最大值是多少．
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