You are given integers and
. Among all real solutions
to the equations
and
, what is the maximal value of
?
Constraints
Input Specification
The only line contains two space-separated integers, and
.
Output Specification
If there are no solutions, output no
; otherwise, output the maximal value of .
Your answer will be accepted if the absolute error is within .
Sample Input
7 13
Sample Output
2.500000
Explanation for Sample
The maximal value of is reached at
.
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