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 (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>

typedef long long ll;

#define min(a, b) ((a) < (b)) ? (a) : (b)
#define max(a, b) ((a) > (b)) ? (a) : (b)
#define swap(a, b, typ) \
    do { \
        typ tmp = a; \
        a = b; \
        b = tmp; \
    } while (0)

int main(void) {
    int r;
    scanf("%d\n", &r);
    printf("%d\n", r * r);

    return 0;
}