The answer is...
N=(R)x(fp)x(ne)x(fl)x(fi)x(fc)x(L)
N = Number of civilizations in galaxy able to communicate with Earth.
R = Number of new stars formed in our galaxy each year.
fp = Faction of those stars with planetary systems.
ne = Average number of planets in each system that can support life.
fl = Fraction of such planets on which life actually originates.
fi = Fraction of life-sustaining planets on which intelligent life evolves.
fc = Fraction of intelligent life-bearing planets on which the intelligent beings develop the means and the will to communicate over interstellar distances.
L = The average lifetime of such technological civilizations.
So now you know.
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