HP35s Entering complex number arguments

[Merwedv]

I feel that I am missing something, but I am struggling to enter non-trivial arguments for complex numbers in RPN mode on the HP35s. For example, how would I enter something like "5 theta pi"? When I try it the obvious way, I get a syntax error. Or if I would like to do something like "2*2 + 4i"?

Is there a way to use the value of the stack registers as the arguments for complex numbers? I am also not able to use stored values for the arguments for complex numbers.

I really hope there is a simple way to do this, and that I do not have to write programs to do simple things like this, something that I am completely unfamiliar with.

BR,