Goal: Learn to write arithmetic expressions leveraging operator precedence.

Assignment: In mathematics, the harmonic mean is a specific kind of average. It can be expressed as the reciprocal of the arithmetic mean of the reciprocals; for example, the harmonic mean

of $4$ and $3$ is:

$(\frac{\frac{1}{4}+\frac{1}{3}}{2}{)}^{-1}$

Given the two int variables $n$ and $m$ that have been initialized to unknown values and a double variable harmonicMean that has been only declared, write a single statement that assigns the

value of the harmonic mean between $n$ and $m$ to harmonicMean.