Contest Duration: - (local time) (100 minutes) Back to Home
A - Discount /

Time Limit: 2 sec / Memory Limit: 1024 MB

### 制約

• A, B は整数
• 1 ≤ B < A ≤ 10^5

### 入力

A B


### 入力例 1

100 80


### 出力例 1

20.0


### 入力例 2

7 6


### 出力例 2

14.285714285714285714


### 入力例 3

99999 99998


### 出力例 3

0.00100001000010000100


Score : 100 points

### Problem Statement

A shop sells a product whose regular price is A yen (Japanese currency) for B yen. By what percentage of the regular price is this product discounted?

### Constraints

• A and B are integers.
• 1 ≤ B < A ≤ 10^5

### Input

Input is given from Standard Input in the following format:

A B


### Output

Print the answer as a decimal.
Your answer will be judged as correct when its absolute or relative error from our answer is at most 10^{-2}.

### Sample Input 1

100 80


### Sample Output 1

20.0


If a product whose regular price is 100 yen is sold for 80 yen, it is discounted by 20 percent of the regular price.

### Sample Input 2

7 6


### Sample Output 2

14.285714285714285714


### Sample Input 3

99999 99998


### Sample Output 3

0.00100001000010000100