Description

There is a function: $f(x)=x^5-15x^4+85x^3-225x^2+274x-121$. It is known that $f(1.5)>0$, $f(2.4)< 0$, and the equation $f(x)=0$ has exactly one root in the interval [$1.5,2.4$]. Please use the bisection method to find this root.

Input Format

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Output Format

The root of the equation in the interval [$1.5,2.4$]. The result should be rounded to 6 decimal places.

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