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[EnergyPlus_Support] Erl - Counting the time steps

I have an Erl program like this:  

EnergyManagementSystem:Program,
    R2Calculation,           !- Name
    set n = n + 1,           !- Program Line 1
    set R2 = n * ... ;       !- Program Line 2

I use the variable "n" to count the time steps. I put this program in "EndOfZoneTimestepBeforeZoneReporting" but the variable counts the time steps of warmup period as well which I do not want. 

How can I define a variable that has the value of 1 at the first step of running period and counts the steps afterward?




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