Divisors

문제

Your task in this problem is to determine the number of divisors of $\left(\genfrac{}{}{0px}{}{n}{k}\right)n\; \backslash choose\; k$. Just for fun -- or do you need any special reason for such a useful computation?

입력

The input consists of several instances. Each instance consists of a single line containing two integers n and k (0 ≤ k ≤ n ≤ 431), separated by a single space.

출력

For each instance, output a line containing exactly one integer -- the number of distinct divisors of $\left(\genfrac{}{}{0px}{}{n}{k}\right)n\; \backslash choose\; k$. For the input instances, this number does not exceed 2⁶³ - 1.