Largest value of an expression

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Suppose I give myself symbols of function (eg $\exp$, $\sqrt{}$...), symbols of constants (eg $1$, $e$, $\pi$...) and symbols of operations (eg $+$, $\times$,...). I allow myself to use each one a certain amount of times and I wonder, among the expressions I can form, which one has largest value when evaluated. In a particular case I can try each possibility, but I would like to know if there is a general theory about related issues.