In how many ways can you choose k elements out of n elements, not taking order into account?
Write a program to compute this number.
Input
The input will contain one or more test cases.
Each test case consists of one line containing two integers n (n >= 1) and k (0 <= k <= n).
Input is terminated by two zeroes for n and k.
Output
For each test case, print one line containing the required number. This number will always fit into an integer, i.e. it will be less than 2^31.
Sample Input
4 2
10 5
49 6
0 0
Sample Output
6
252
13983816
