增加一组hack：
输入：

6 6 2
-10 -10 -10 -10 -10 -10
-10 -10 -10 -10 -10 -10
-10 -10 -1 -1 -10 -10
-10 -10 -1 -1 -10 -10
-10 -10 -10 -10 -10 -10
-10 -10 -10 -10 -10 -10

输出：

3 3