Problem:
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

Solution in C (Clang 3.8.0) (judge verdict: Wrong Answer)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

#define M_PI 3.14159265358979323846
#define basicR 1.0

int main()
{
	int inputS, differenceValue;
	double firstArea, secondArea;
	scanf("%d", &inputS);

	firstArea = M_PI * pow(basicR, 2);
	secondArea = M_PI * pow(inputS, 2);
	differenceValue = secondArea / firstArea;

	printf("%d \n", differenceValue);

	return 0;
}