Set initial value to decrement from when using a sum block loop in Simulink

I want to decrease a value down to zero using a negative sum block loop in Simulink. I can get the value to decrease by my specified decrement, but I'm not sure how to set the initial value. The block model is:

This configuration starts from 0 and decrements downwards from there:

How do I change the setup so that the initial starting value on the y-axis is also the same as the constant value (in this example 5) that is decremented?

Thanks for the help!

Answer 1

[Fangjun Jiang]

Double click the Unit Delay block and set the initial value there.