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Consider a polynomial optimization problem. Adding polynomial equations generated by the Fritz John conditions to the constraint set does not change the optimal value. As proved in [arXiv:2205.04254 (2022)], the objective polynomial has finitely many values on the new constraint set under some genericity assumption. Based on this, we provide an algorithm that allows us to compute exactly this optimal value. Our method depends on the computations of real radical generators and Gr\"obner basis. Finally, we apply our method to solve some instances of mathematical program with complementarity constraints., Comment: 19 pages, 1 table