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ZOJ Problem Set - 2105
Number Sequence

Time Limit: 2 Seconds      Memory Limit: 65536 KB

A number sequence is defined as follows:

f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7.

Given A, B, and n, you are to calculate the value of f(n).


Input

The input consists of multiple test cases. Each test case contains 3 integers A, B and n on a single line (1 <= A, B <= 1000, 1 <= n <= 100,000,000). Three zeros signal the end of input and this test case is not to be processed.


Output

For each test case, print the value of f(n) on a single line.


Sample Input

1 1 3
1 2 10
0 0 0


Sample Output

2
5



Author: CHEN, Shunbao
Source: Zhejiang Provincial Programming Contest 2004
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