This is an example programming model of ODMO program.
$$
\begin{align}
\underset{x,y,z}{\text{min}} & \quad c_{11}x^{a_{11}}y^{a_{12}}z^{a_{13}} + c_{12}x^{a_{14}}y^{a_{15}}z^{a_{16}} + c_{13}x^{a_{17}}y^{a_{18}}z^{a_{19}} \\
\text{s.t.} & \quad c_{21}x^{a_{21}}y^{a_{22}}z^{a_{23}} + c_{22}x^{a_{24}}y^{a_{25}}z^{a_{26}} \leq 1 \\
& \quad c_{31}x^{a_{31}}y^{a_{32}}z^{a_{33}} + c_{32}x^{a_{34}}y^{a_{35}}z^{a_{36}} + c_{33}x^{a_{37}}y^{a_{38}}z^{a_{39}} \leq 1 \\
& \quad c_{41}x^{a_{41}}y^{a_{42}}z^{a_{43}} = 1
\end{align}
$$
[Set] appropriate values below to describe your problem.