Replace value of z axis

Hi everyone,
Can some one show me how to replace z value of a point.
Ex. I have a point (0,0,3) and I like to replace z value by 5, so the result should be (0,0,5).
Thank you

just deconstruct that point and replace Z value while making a new one:


how easy it is! Thank you very much, @Konrad_K_Sobon