"Inverse" Cumulative Sum

Hi,

I wonder to know to create this "inverse" cumulative sum.

As a reference, I already took this link already, it works...

cumulative for certain period

But instead of start with the value of the first period, I want to start from the total and subtracting the value of the current period until cero

Date   Value  "Inverse"Cumulative  "Normal"Cumulative

Day0    0       12                                      0

Day1    2       10                                      2

Day2    4       6                                        6

Day3    6       0                                       12

Thanks in advance