013. Resistors in Parallel

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013. Resistors in Parallel
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output
When two resistors with resistances a and b are parallel in an electronic circuit, their equivalent resistance is calculated as (a * b) / (a + b). Given the resistances of two resistors, calculate their equivalent resistance.
Input
The first line of input contains a single positive integer a: the resistance of the first resistor. The second line of input contains a single positive integer b: the resistance of the second resistor.
Output
Output a single positive decimal number r: the equivalent resistance of the two resistors, calculated using the above formula.
Examples
input
Copy
60
40
output
Copy
24.0
input
Copy
80
70
output
Copy
37.333333333333336

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