sum values in "B" if repeating in "A"

I have 2 columns, “A” contains a name and “B” contains a value. Some of the names in “A” are repeated. If they are repeated in “A” I need the sum of there “B” values. So for example

“A” “B”
Bob 10
Sam 4
Bob 5
Joe 6
Fred 9

I need to know that Bob is 15, Sam is 4, Joe is 6, and Fred is 9. There are about 3000 rows and the data will change in the future so doing it manually will be time consuming. Is there a function that can do this fo me?

In the dataset there are thousands of values hundreads of which are probally repeating. I was looking for something that I wouldent have to manually seek out each repeating value. But thanks for the attempt.

I got it. incase anyone else has the same question

=IF((IF(COUNTIF($A$1:A1,A1)>1,COUNTIF($A1:A$1,A1),0))=0,SUMIF(A:A,A1,B:B),0)