At a car rental company the cars leave with a full tank, but have to be returned with a full tank as well. A customer hires a car of which the milometer indicates $$b$$ kilometres at the start. When the customer returns the vehicle the milometer indicates $$e$$ kilometres and he has to refuel $$l$$ litres of petrol.

Input

The decimal numbers $$b$$, $$e$$ and $$l$$, in that order and on three separate lines.

Output

The petrol consumption of the car in litres per hundred kilometres.

Example

Input:

123.789
666.666
62.5

Output:

11.5127368