SUMIFS to calculate costs which have a po number

hi newbie here
i want to add the column with cost, BUT the cost has to have a PO No
so basically anything with a blank value in PO No column, the cost is not included in the cost total row
i am using formula =SUMIFS(b3:b18,c3:c18,"no blanks"), but not sure where i'm going wrong.
any assistance would be appreciated

Maybe

=SUMIFS(B2:B17,C2:C17,"<>")

maybe

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thank you, it gave me the values i was chasing

=SUMIF(C2:C17,"<>""",B2:B17)
also seems to work.