power analysis for sample counts based on MAF

Question

[J.F.Jiang]

Hi all,

I am confused about one question of power analysis based on MAFs.

As far as I know, we have 84 million SNPs with MAFs from 1000G project.

My question is how many samples we need if we want to cover 99.9% SNPs which appear in one sample at least, and the 95% CI is?

Thanks!