Solved by 101 users: ...
UserDateAttemptTimeCMSC
RAVEman`07 jan 2009`C++800.0155
fese`14 nov 2007`C++1300.0255
zloy_mipt`30 may 2008`C++500.0157
fese`07 feb 2008`C++1700.0157
david_it21`17 apr 2008`C++2800.0159
murphy`26 jul 2009`C++4700.0259
Philip_PV`13 jul 2008`C++300.0161
RAVEman`07 jan 2009`C++500.0161
DAV`30 jun 2009`C++3200.0161
Philip_PV`13 jul 2008`C++200.0162
checkil`27 oct 2011`C100.0163
polzovatel`26 oct 2011`C++500.0163
glueray`03 nov 2006`C++600.0163
glueray`03 nov 2006`C++700.0163
 C++ 84 C 10 Java 4 FPC 4 Kylix 2 Ruby 1 Python 1
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## Root of the equation

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).

 Input#1```1000 ``` Output#1```NO ```
 Input#2```1.5 ``` Output#2```1.3103706971044483036 ```

Author:
Voroztsov Artem
7 November 2004

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