|Online MIPT programming contest||РУССКИЙ|
Time limit = 1 second(s)Solve the equation
x^(x^(x^(x^( ... infinite ... )))) = A
where x is a positive real number.
Right side of the equation is limit of Fn(x) as n tends to infinity where
Fn(x) = x^(x^(x^(x^( ... n times ... ))));
Input The real number A (number of given digits less then 20).
Output If there is no root, output NO. Otherwise output the root (only one) with accuracy 10^(-19).
7 November 2004
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