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Problem A
Pizza 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 |
