[热身题][hdoj_1005]Number Sequence

// hdoj_1005 Number Sequence
// 31MS	220K	370 B	GCC

#include <stdio.h>

int fun(int a, int b, __int64 n);

int main(void)
{
	int a, b;
	__int64 n;
	while(scanf("%d%d%I64d", &a, &b, &n) && a != 0 && b != 0 && n != 0)
	{
		printf("%d\n", fun(a, b, n%49));
	}
	return 0;
}

int fun(int a, int b, __int64 n)
{
	if(n == 1 || n == 2)
		return 1;
	else
		return (a*fun(a, b, n-1) + b*fun(a, b, n-2)) % 7;
}