LTAI-21-11-28 Practice

#### Start

2021-11-25 03:00 AKST

## LTAI-21-11-28 Practice

#### End

2021-12-01 09:00 AKST
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# Problem DPizza Crust

Photo by cyclonebill.

George has bought a pizza. George loves cheese. George thinks the pizza does not have enough cheese. George gets angry.

George’s pizza is round, and has a radius of $R$ cm. The outermost $C$ cm is crust, and does not have cheese. What percent of George’s pizza has cheese?

## Input

The input consists of a single line with two space separated integers, $R$ and $C$.

## Output

Output the percentage of the pizza that has cheese. Your answer must have an absolute or relative error of at most $10^{-6}$.

## Limits

• $1 \leq C \leq R \leq 100$

Sample Input 1 Sample Output 1
1 1

0.000000000

Sample Input 2 Sample Output 2
2 1

25.000000