can anyone plz explain this ques and its relevant answer?

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What function of $x$, $n$ is computed by this program?

Function what(x, n:integer): integer: Var value : integer begin value := 1 if n > 0 then begin if n mod 2 =1 then value := value * x; value := value * what(x*x, n div 2); end; what := value; end;

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