Question: How can I plot specifically positive integers?

I wrote a procedure shrinkTime:=proc(n::posint); The procedure only works with a positive integers and I need to plot this function. However, whenever I goto plot it; plot(shrinkTime(n)); I get this error: " Error, invalid input: shrinkTime expects its 1st argument, n, to be of type posint, but received posint" How can I specifically instruct maple to only plot at points where x is a positive integer?
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