Sum Cells In One Column If Data In Next Two Columns Equal

I have three columns: Symbol, Dividend Payment, and Shares.

What formula will look at the shares column and symbol column and say if cells in column C are equal each other & cells in Column A are equal to each other than add all the div payment that correspond with those symbols and shares?

A
B
C
D

1
Symbol
Dividend Payment
Shares
Sum (Formula would go here)

2
SEB
.75
23

3
SEB
.75
23

(result desired) 1.5 (B2+B3) because (add the dividend where their symbol (A2&A3)and shares (C2&C3)are equal) both conditions have to apply to add div payment

[Code] ......