I received many TLEs for this problem:

- Make sure you pre-compute enough primes ahead using Sieve of Eratosthenes

- Pay attention to the way you compute the primes (my original implementation was slow).

I also received two WAs because of how I was rounding the result:

- For some reason my rounding idea (commented in the code) didn't work, I googled the problem and I corrected my output.

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