# An infinite summation of Totient.

$\sum_{n=1}^{\infty} \frac{\phi(n)}{n^{4}} = S$

$$S$$ can be written in the format given below . $S = \zeta (a) \cdot \dfrac{b}{\pi ^{c}}.$

Submit your answer as $$a+b+c$$

Notation: $$\zeta(\cdot)$$ denotes the Riemann zeta function.

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