Description

Your task in this problem is to determine the number of divisors of

. Just for fun -- or do you need any special reason for such a useful computation?

Input

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.

Output

For each instance, output a line containing exactly one integer -- the number of distinct divisors of

. For the input instances, this number does not exceed 2

- 1.

5 1
6 3
10 4

2
6
16

Source