Dear all, see any body can help !

I have a list with expenses list by a group of employees for the week:

Day Staff Claim Amount1
1 A 10
2 B 10
2 A 10
3 B 10
3 A 10
4 C 10
4 D 5
5 E 5
5 F 2


Expected Result

Top 3 Staff who made highest claim for the week

Staff Total Amounts Claim

A 30
B 20
C 10

Problem : How to find out the top 3 emplyees who make highest claims for the week, subtotal of each employee's claims and rank it in descending order ?

Of course I can subtotal the data by employee name first and rank it mannually, but how to perform it more quickly and effectively ?

Thanks in advance for those can concern and help.