sum all cells having a not empty cell on the right

Question

  |A|B
 --------------
 1|1|some text|
 2|2|         | 
 3|5|other    |

How I can sum column A, including only cells having not empty values in their right neighbour cells(B)?

In this example I would expect result to be 6, because it should only sum A1 with A3 ignoring A2, because B2 is empty.

Played around with SUMIF but can't manage it.

Answer 1

=SUMIF(B1:B3,"<>",A1:A3)