Description

For resistors with resistances $r_1$ and $r_2$, the formula for calculating the equivalent parallel resistance is: $R =\frac{1}{\frac{1}{r1} + \frac{1}{r2}}$.
Input the resistance values of the two resistors, as floating-point numbers.
Output the equivalent parallel resistance, rounded to $2$ decimal places.

Input Format

The resistance values of the two resistors, as floating-point numbers, separated by a space.

Output Format

The equivalent parallel resistance, rounded to $2$ decimal places.

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0.67