This is an example programming model of ODMO program.
$$
\begin{align}
\underset{x, y, z}{\min} & \quad G(x, y, z) \triangleq \frac{a}{xyz} + byz + cxz + dxy \\
\text{s.t.} & \quad x, y, z \geq 0 \\
& \quad a, b, c, d \in \mathbb{R}^+
\end{align}
$$
[Set] appropriate values below to describe your problem.