The case is I want to key in two criteria and the function give me back the
total. For example, I want Sun in the rows and Two in the column, then will
give me the total of  2 + 8 = 10. The Sun and the Two is input some where and
will be change from time to time.
       A      B    C    D
1            One        Two       Three
2       Sun      1     2    3   
3       Mon       4             5             6
4       Sun      7             8             9

I tried using SUMPRODUCT but did not seem to work, may be due to my
knowledge is not good enough, anyone know how or have other functions that
make it work?

Thanks very much.