这道题的输入输出部分一定要这样写：

    while (scanf("%lld%lld%lld", &a, &b, &c))
	{
		if (a == -1 && b == -1 && c == -1)
			return 0;
		printf("w(%lld, %lld, %lld) = ", a, b, c);
		printf("%lld\n", w(a, b, c));
	}

要不然就只能得20分！