组合

计算组合数 C(n, k)

输入：

输入包括若干行

每行输入两个整数n, k, 其中1 <= k <= n <= 60

最后输入0 0表示结束

输出：

输出对应也有若干行

每行输出计算结果-combination

A combination of computing the number C (n, k)

enter:

Inputs include several lines

Each line of input two integers n, k, where 1 <= k <= n <= 60

00 indicates the end of the last input

Output:

Outputs corresponding to the number of lines is also

Each line of output results