Sum column based on condition based on corresponding column in excel

Question

There are two column

A B
1 1

2 1

3 3

Now I want to sum column A if A-(B+C) is equal to 0.

so for above example sum would be 1+3 = 4

Answer 1

Adjust ranges as necessary:

=SUMPRODUCT((A1:A3=B1:B3)*A1:A3)