How can I change repeating date to one in excel?

I have below question:
On column A1: A16, I have some repeated dates.
On column B1:B16, I have the numbers which are assigned each one only to a date on column A. For instance, B1 to A1, B2 to A2 and etc.
I copy column A to column C and use from Data – Remove Duplicates.
Now, I want to have total sum of numbers which are assigned to each exact date on column D (front of column C).
I have attached an example of excel sheet.
How can I do?
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Thank you very much for your answer. It's work.