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

Time Limit: 2 sec / Memory Limit: 1024 MB

### 問題文

なお答えは制約の下では必ず整数になることが示せます。

### 制約

• 1 \leq r \leq 100
• 入力中のすべての値は整数である。

### 入力

r


### 入力例 1

2


### 出力例 1

4


4.0 などの形式で出力すると不正解になることに注意してください。

### 入力例 2

100


### 出力例 2

10000


Score : 100 points

### Problem Statement

Given is an integer r.

How many times is the area of a circle of radius r larger than the area of a circle of radius 1?

It can be proved that the answer is always an integer under the constraints given.

### Constraints

• 1 \leq r \leq 100
• All values in input are integers.

### Input

Input is given from Standard Input in the following format:

r


### Output

Print the area of a circle of radius r, divided by the area of a circle of radius 1, as an integer.

### Sample Input 1

2


### Sample Output 1

4


The area of a circle of radius 2 is 4 times larger than the area of a circle of radius 1.

Note that output must be an integer - for example, 4.0 will not be accepted.

### Sample Input 2

100


### Sample Output 2

10000