# Binomial Showdown

Time Limit: 1 Second Memory Limit: 32768 KB

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 13983816Submit

Source: University of Ulm Local Contest 1997