Problem #360
Phir Se Wahi Phi
Let C(n) be \sum (\phi(a) \times b) taken over ordered pairs (a, b) of positive integers for which a \times b divides n.
Let F(k) = \sum_{i=1}^{k} \frac{C(i)}{i}.
Let x = \sum_{k=1}^{\infty} \frac{F(k)}{k \times 2^k}.
Output \lfloor x \times 10^5 \rfloor.