射线和圆的相交的计算的问题,是如何利用C语言的程序的代码的编写的技术的方式实现的

Problem Description
Beads of red, blue or green colors are connected together into a circular necklace of n beads ( n < 40 ). If the repetitions that are produced by rotation around the center of the circular necklace or reflection to the axis of symmetry are all neglected, how many different forms of the necklace are there?

Input
The input has several lines, and each line contains the input data n.
-1 denotes the end of the input file.

Output
The output should contain the output data: Number of different forms, in each line correspondent to the input data.

Sample Input
4
5
-1

Sample Output
21
39

0
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