4. Mathematical model

The mathematical formulation of the priority-setting problem is as follows.

Let X _i be the amount of investment in the i ^th project and let F * be the optimal allocation of resources in the n ^th project that allows the profit of all projects to be maximized. The optimization problem can be formulated as follows: find X _n (x ₁ ,x ₂ ,x ₃ , ..., x _n ) that maximizes total profit in terms of performance, with the following constraints:

1) budget limitations for rehabilitation projects...