Well, using the initial parameters gives a value of one for the Milky Way. Since the Andromeda galaxy appear to have about 62.5 times as many stars (lower estimate), and if you assume a rate of star formation proportional to the existing number of stars, then you would have to scale up the R term to 625 stars/year. This would increase the number to 62.5.

How is the value of one AMU defined? (trick question)

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