SUMIFS function?

is there a way to sum a column based off of two criteras for the same column.
so say i have numbers in column A and in column B is my critera the options are UG, GU, P, and GG.
i want to sum the numbers in column A if the corresponding cells in column B are UG or GU.

im trying this and its not working
=SUMIFS(A1:A15,B1:B15,"=UG",B1:B15,"=GU")

i think that its not working because im referencing the same cells (column B) twice.

is there another way to make this work? maybe with a OR statement

any help would be awesome

thanks
JED