[R] Plot title with numeric variables

[RMan54]

I am trying to create a plot title in R with substitution by a numeric
variable (Figure number N) within the text which is bold and has a
subcripted part as well. Here is what I have:

title <- expression(bold(paste("Figure ", N, ": Plot ", C[max], " versus
CrCL")))

plot(1, main="") # Simple plot for testing
N <- 5
mtext(title, line=3, font=2, cex=1.25)

I have the bold part and the subscripted text worked out but how do I
replace the text "N" in the title by its numeric value (5 in this example)?
I tried all kinds of stuff with substitute, etc. but can't figure it out. 

The last 3 lines are actually from a function with title as argument. N is
internal to the function and changes.

Any help is much appreciated. Thanks.
Rene

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