How many will succeed?

Electrically charged drops of mercury fall from an altitude hh into a spherical metal vessel of radius RR in the upper part of which there is a small opening. The mass of each drop is mm and the charge of the drop is qq. The number nn of the last drop that can still enter the sphere is n2πϵ0mg(hR)Rq2\large n*2\pi \epsilon_0 \frac{mg(h-R)R}{q^2}. Then what is the value of nn?

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