正整数x 的约数是能整除x 的正整数。正整数x 的约数个数记为div(x)。例如，1，2，5，10 都是正整数10 的约数，且div(10)=4。设a 和b 是2 个正整数，a≤b，找出a 和b之间约数个数最多的数x。

对于给定的2 个正整数a≤b，编程计算a 和b 之间约数个数最多的数。

数据输入

输入数据由文件名为input.txt的文本文件提供。文件的第1 行有2 个正整数a和b。

结果输出

程序运行结束时，若找到的a 和b 之间约数个数最多的数是x，将div(x)输出到文件output.txt中。

输入文件示例 输出文件示例

input.txt output.txt

1 36 9

-Positive integer x can be about a few of the positive integer x divisible. Positive integer x the approximate number recorded as the number of div (x). For example, 1,2,5,10 are about 10 positive integer number, and div (10) = 4. Set a and b are two positive integers, a ≤ b, to find a and b between about a few number of the largest number of x. For a given two positive integers a ≤ b, Programming calculated a and b between about a few number of the largest number. Data entry input data from the document text file named input.txt provide. File line 1 has two positive integers a and b. The results run the end of the output, if found between a and b of about a few number of the largest number are x, the div (x) of output to a file output.txt. Sample input file output file example input.txt output.txt 1 36 9