The first few natural numbers 1, 2, 3, ..., n (n > 50), if any 50 numbers are selected from them, two numbers can be found, the difference between these two numbers is equal to 7, and the maximum value of n is How many.
前几个自然数1，2，3，…，n(n＞50)，如果从中任取50个数，都能找到两个取出的数，这两个数的差等于7，n的最大值是多少．
<result>86</result>